25388979 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 13072800.

The previous prime is 25388971. The next prime is 25388981. The reversal of 25388979 is 97988352.

It is not a de Polignac number, because 25388979 - 2³ = 25388971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25388971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29842 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^25388979 is an apocalyptic number.

25388979 is a deficient number, since it is larger than the sum of its proper divisors (17188941).

25388979 is a wasteful number, since it uses less digits than its factorization.

25388979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991.

The product of its digits is 1088640, while the sum is 51.

The square root of 25388979 is about 5038.7477611010. The cubic root of 25388979 is about 293.9104845714.

The spelling of 25388979 in words is "twenty-five million, three hundred eighty-eight thousand, nine hundred seventy-nine".