25477979 has 4 divisors (see below), whose sum is σ = 26356560. Its totient is φ = 24599400.

The previous prime is 25477961. The next prime is 25477981. The reversal of 25477979 is 97977452.

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 25477979 - 2⁸ = 25477723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25477909) 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, 439247 + ... + 439304.

It is an arithmetic number, because the mean of its divisors is an integer number (6589140).

Almost surely, 2^25477979 is an apocalyptic number.

25477979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25477979 is a deficient number, since it is larger than the sum of its proper divisors (878581).

25477979 is an equidigital number, since it uses as much as digits as its factorization.

25477979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878580.

The product of its digits is 1111320, while the sum is 50.

The square root of 25477979 is about 5047.5715943412. The cubic root of 25477979 is about 294.2535143458.

The spelling of 25477979 in words is "twenty-five million, four hundred seventy-seven thousand, nine hundred seventy-nine".