25139479 has 2 divisors, whose sum is σ = 25139480. Its totient is φ = 25139478.

The previous prime is 25139453. The next prime is 25139507. The reversal of 25139479 is 97493152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25139479 - 2⁷ = 25139351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25139579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12569739 + 12569740.

It is an arithmetic number, because the mean of its divisors is an integer number (12569740).

Almost surely, 2^25139479 is an apocalyptic number.

25139479 is a deficient number, since it is larger than the sum of its proper divisors (1).

25139479 is an equidigital number, since it uses as much as digits as its factorization.

25139479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 25139479 is about 5013.9284996896. The cubic root of 25139479 is about 292.9445510824.

The spelling of 25139479 in words is "twenty-five million, one hundred thirty-nine thousand, four hundred seventy-nine".