15225979 has 4 divisors (see below), whose sum is σ = 15549984. Its totient is φ = 14901976.

The previous prime is 15225943. The next prime is 15225983. The reversal of 15225979 is 97952251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15225979 - 2¹⁷ = 15094907 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15225989) 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, 161932 + ... + 162025.

It is an arithmetic number, because the mean of its divisors is an integer number (3887496).

Almost surely, 2^15225979 is an apocalyptic number.

15225979 is a deficient number, since it is larger than the sum of its proper divisors (324005).

15225979 is an equidigital number, since it uses as much as digits as its factorization.

15225979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324004.

The product of its digits is 56700, while the sum is 40.

The square root of 15225979 is about 3902.0480519850. The cubic root of 15225979 is about 247.8535110868.

The spelling of 15225979 in words is "fifteen million, two hundred twenty-five thousand, nine hundred seventy-nine".