15372921 has 4 divisors (see below), whose sum is σ = 20497232. Its totient is φ = 10248612.

The previous prime is 15372911. The next prime is 15372923. The reversal of 15372921 is 12927351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-15372921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15372923) 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 3 ways as a sum of consecutive naturals, for example, 2562151 + ... + 2562156.

It is an arithmetic number, because the mean of its divisors is an integer number (5124308).

Almost surely, 2^15372921 is an apocalyptic number.

It is an amenable number.

15372921 is a deficient number, since it is larger than the sum of its proper divisors (5124311).

15372921 is an equidigital number, since it uses as much as digits as its factorization.

15372921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124310.

The product of its digits is 3780, while the sum is 30.

The square root of 15372921 is about 3920.8316719798. The cubic root of 15372921 is about 248.6482832865.

The spelling of 15372921 in words is "fifteen million, three hundred seventy-two thousand, nine hundred twenty-one".