15317397 has 16 divisors (see below), whose sum is σ = 22752960. Its totient is φ = 10184400.

The previous prime is 15317377. The next prime is 15317399. The reversal of 15317397 is 79371351.

It is not a de Polignac number, because 15317397 - 2¹⁰ = 15316373 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15317399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18247 + ... + 19067.

It is an arithmetic number, because the mean of its divisors is an integer number (1422060).

Almost surely, 2^15317397 is an apocalyptic number.

It is an amenable number.

15317397 is a deficient number, since it is larger than the sum of its proper divisors (7435563).

15317397 is an equidigital number, since it uses as much as digits as its factorization.

15317397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1515 counting only the distinct ones).

The product of its digits is 19845, while the sum is 36.

The square root of 15317397 is about 3913.7446263138. The cubic root of 15317397 is about 248.3485657468.

The spelling of 15317397 in words is "fifteen million, three hundred seventeen thousand, three hundred ninety-seven".