25129939 has 2 divisors, whose sum is σ = 25129940. Its totient is φ = 25129938.

The previous prime is 25129903. The next prime is 25129943. The reversal of 25129939 is 93992152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25129939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25129999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564969 + 12564970.

It is an arithmetic number, because the mean of its divisors is an integer number (12564970).

Almost surely, 2^25129939 is an apocalyptic number.

25129939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25129939 is an equidigital number, since it uses as much as digits as its factorization.

25129939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 25129939 is about 5012.9770595924. The cubic root of 25129939 is about 292.9074905874.

The spelling of 25129939 in words is "twenty-five million, one hundred twenty-nine thousand, nine hundred thirty-nine".