25518979 has 8 divisors (see below), whose sum is σ = 26134848. Its totient is φ = 24906240.

The previous prime is 25518953. The next prime is 25518991. The reversal of 25518979 is 97981552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25518979 - 2⁵ = 25518947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25518179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26649 + ... + 27589.

It is an arithmetic number, because the mean of its divisors is an integer number (3266856).

Almost surely, 2^25518979 is an apocalyptic number.

25518979 is a deficient number, since it is larger than the sum of its proper divisors (615869).

25518979 is an equidigital number, since it uses as much as digits as its factorization.

25518979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its digits is 226800, while the sum is 46.

The square root of 25518979 is about 5051.6313206726. The cubic root of 25518979 is about 294.4112705582.

The spelling of 25518979 in words is "twenty-five million, five hundred eighteen thousand, nine hundred seventy-nine".