25279939 has 2 divisors, whose sum is σ = 25279940. Its totient is φ = 25279938.

The previous prime is 25279913. The next prime is 25279951. The reversal of 25279939 is 93997252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25279939 - 2⁹ = 25279427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25279979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639969 + 12639970.

It is an arithmetic number, because the mean of its divisors is an integer number (12639970).

Almost surely, 2^25279939 is an apocalyptic number.

25279939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25279939 is an equidigital number, since it uses as much as digits as its factorization.

25279939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 46.

The square root of 25279939 is about 5027.9159698627. The cubic root of 25279939 is about 293.4891207887.

The spelling of 25279939 in words is "twenty-five million, two hundred seventy-nine thousand, nine hundred thirty-nine".