25791979 has 4 divisors (see below), whose sum is σ = 25950376. Its totient is φ = 25633584.

The previous prime is 25791977. The next prime is 25792003. The reversal of 25791979 is 97919752.

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 25791979 - 2¹ = 25791977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25791971) 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, 78954 + ... + 79279.

It is an arithmetic number, because the mean of its divisors is an integer number (6487594).

Almost surely, 2^25791979 is an apocalyptic number.

25791979 is a deficient number, since it is larger than the sum of its proper divisors (158397).

25791979 is a wasteful number, since it uses less digits than its factorization.

25791979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158396.

The product of its digits is 357210, while the sum is 49.

The square root of 25791979 is about 5078.5804118868. The cubic root of 25791979 is about 295.4574116243.

The spelling of 25791979 in words is "twenty-five million, seven hundred ninety-one thousand, nine hundred seventy-nine".