25690839 has 32 divisors (see below), whose sum is σ = 38085120. Its totient is φ = 15345792.

The previous prime is 25690801. The next prime is 25690843. The reversal of 25690839 is 93809652.

It is not a de Polignac number, because 25690839 - 2⁸ = 25690583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25690839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25690039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73864 + ... + 74210.

It is an arithmetic number, because the mean of its divisors is an integer number (1190160).

Almost surely, 2^25690839 is an apocalyptic number.

25690839 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25690839 is a deficient number, since it is larger than the sum of its proper divisors (12394281).

25690839 is a wasteful number, since it uses less digits than its factorization.

25690839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 25690839 is about 5068.6131239226. The cubic root of 25690839 is about 295.0707060241.

The spelling of 25690839 in words is "twenty-five million, six hundred ninety thousand, eight hundred thirty-nine".