25690979 has 4 divisors (see below), whose sum is σ = 25730976. Its totient is φ = 25650984.

The previous prime is 25690933. The next prime is 25690991. The reversal of 25690979 is 97909652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25690979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25690079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19019 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (6432744).

Almost surely, 2^25690979 is an apocalyptic number.

25690979 is a deficient number, since it is larger than the sum of its proper divisors (39997).

25690979 is an equidigital number, since it uses as much as digits as its factorization.

25690979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39996.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 25690979 is about 5068.6269343877. The cubic root of 25690979 is about 295.0712420105.

The spelling of 25690979 in words is "twenty-five million, six hundred ninety thousand, nine hundred seventy-nine".