25205979 has 4 divisors (see below), whose sum is σ = 33607976. Its totient is φ = 16803984.

The previous prime is 25205969. The next prime is 25206011. The reversal of 25205979 is 97950252.

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

It is not a de Polignac number, because 25205979 - 2⁴ = 25205963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25205909) 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, 4200994 + ... + 4200999.

It is an arithmetic number, because the mean of its divisors is an integer number (8401994).

Almost surely, 2^25205979 is an apocalyptic number.

25205979 is a deficient number, since it is larger than the sum of its proper divisors (8401997).

25205979 is an equidigital number, since it uses as much as digits as its factorization.

25205979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8401996.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 25205979 is about 5020.5556465395. Note that the first 3 decimals coincide. The cubic root of 25205979 is about 293.2026267130.

The spelling of 25205979 in words is "twenty-five million, two hundred five thousand, nine hundred seventy-nine".