25405979 has 8 divisors (see below), whose sum is σ = 25671360. Its totient is φ = 25142400.

The previous prime is 25405889. The next prime is 25405987. The reversal of 25405979 is 97950452.

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

It is a cyclic number.

It is not a de Polignac number, because 25405979 - 2¹⁶ = 25340443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25405879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65117 + ... + 65505.

It is an arithmetic number, because the mean of its divisors is an integer number (3208920).

Almost surely, 2^25405979 is an apocalyptic number.

25405979 is a deficient number, since it is larger than the sum of its proper divisors (265381).

25405979 is a wasteful number, since it uses less digits than its factorization.

25405979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 25405979 is about 5040.4344058821. The cubic root of 25405979 is about 293.9760689794.

The spelling of 25405979 in words is "twenty-five million, four hundred five thousand, nine hundred seventy-nine".