315397 has 4 divisors (see below), whose sum is σ = 317196. Its totient is φ = 313600.

The previous prime is 315389. The next prime is 315407. The reversal of 315397 is 793513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793513 = 7 ⋅113359.

It can be written as a sum of positive squares in 2 ways, for example, as 312481 + 2916 = 559^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 315397 - 2³ = 315389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604 + ... + 997.

It is an arithmetic number, because the mean of its divisors is an integer number (79299).

2³¹⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

315397 is a deficient number, since it is larger than the sum of its proper divisors (1799).

315397 is a wasteful number, since it uses less digits than its factorization.

315397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798.

The product of its digits is 2835, while the sum is 28.

The square root of 315397 is about 561.6021723605. The cubic root of 315397 is about 68.0694935465.

It can be divided in two parts, 3 and 15397, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 315397 in words is "three hundred fifteen thousand, three hundred ninety-seven".