The number 397 is an odd integer that follows 396 and precedes 398. It is classified as a prime number, meaning it has no positive divisors other than 1 and itself. This makes it unique in the realm of numbers, as prime numbers are fundamental in various areas of mathematics, including number theory. In terms of its properties, 397 can be expressed in different ways, such as the sum of two squares: 397 = 19^2 + 18^2 . Additionally, it is part of the sequence of prime numbers, which includes notable figures like 2, 3, and 5. Prime numbers like 397 play a crucial role in cryptography and computer science.