15321397 has 16 divisors (see below), whose sum is σ = 19055232. Its totient is φ = 11995200.

The previous prime is 15321379. The next prime is 15321401. The reversal of 15321397 is 79312351.

It is not a de Polignac number, because 15321397 - 2⁷ = 15321269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15321377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8358 + ... + 10024.

It is an arithmetic number, because the mean of its divisors is an integer number (1190952).

Almost surely, 2^15321397 is an apocalyptic number.

It is an amenable number.

15321397 is a deficient number, since it is larger than the sum of its proper divisors (3733835).

15321397 is a wasteful number, since it uses less digits than its factorization.

15321397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788.

The product of its digits is 5670, while the sum is 31.

The square root of 15321397 is about 3914.2556125016. The cubic root of 15321397 is about 248.3701818609.

The spelling of 15321397 in words is "fifteen million, three hundred twenty-one thousand, three hundred ninety-seven".