25394979 has 4 divisors (see below), whose sum is σ = 33859976. Its totient is φ = 16929984.

The previous prime is 25394977. The next prime is 25394989. The reversal of 25394979 is 97949352.

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

It is not a de Polignac number, because 25394979 - 2¹ = 25394977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25394977) 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, 4232494 + ... + 4232499.

It is an arithmetic number, because the mean of its divisors is an integer number (8464994).

Almost surely, 2^25394979 is an apocalyptic number.

25394979 is a deficient number, since it is larger than the sum of its proper divisors (8464997).

25394979 is an equidigital number, since it uses as much as digits as its factorization.

25394979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8464996.

The product of its digits is 612360, while the sum is 48.

The square root of 25394979 is about 5039.3431119542. The cubic root of 25394979 is about 293.9336353515.

The spelling of 25394979 in words is "twenty-five million, three hundred ninety-four thousand, nine hundred seventy-nine".