25739999 has 2 divisors, whose sum is σ = 25740000. Its totient is φ = 25739998.

The previous prime is 25739983. The next prime is 25740007. The reversal of 25739999 is 99993752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25739999 - 2⁴ = 25739983 is a prime.

It is a Sophie Germain prime.

25739999 is a modest number, since divided by 9999 gives 2573 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 25739999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25739939) 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, 12869999 + 12870000.

It is an arithmetic number, because the mean of its divisors is an integer number (12870000).

Almost surely, 2^25739999 is an apocalyptic number.

25739999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25739999 is an equidigital number, since it uses as much as digits as its factorization.

25739999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1377810, while the sum is 53.

The square root of 25739999 is about 5073.4602590343. The cubic root of 25739999 is about 295.2587942555.

The spelling of 25739999 in words is "twenty-five million, seven hundred thirty-nine thousand, nine hundred ninety-nine".