25399739 has 2 divisors, whose sum is σ = 25399740. Its totient is φ = 25399738.

The previous prime is 25399733. The next prime is 25399747. The reversal of 25399739 is 93799352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25399739 - 2⁸ = 25399483 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25399693 and 25399702.

It is not a weakly prime, because it can be changed into another prime (25399733) 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, 12699869 + 12699870.

It is an arithmetic number, because the mean of its divisors is an integer number (12699870).

Almost surely, 2^25399739 is an apocalyptic number.

25399739 is a deficient number, since it is larger than the sum of its proper divisors (1).

25399739 is an equidigital number, since it uses as much as digits as its factorization.

25399739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 459270, while the sum is 47.

The square root of 25399739 is about 5039.8153736025. The cubic root of 25399739 is about 293.9519990432.

The spelling of 25399739 in words is "twenty-five million, three hundred ninety-nine thousand, seven hundred thirty-nine".