25139898 has 24 divisors (see below), whose sum is σ = 62251488. Its totient is φ = 7182792.

The previous prime is 25139887. The next prime is 25139927. The reversal of 25139898 is 89893152.

It is a happy number.

25139898 is a `hidden beast` number, since 251 + 398 + 9 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99636 + ... + 99887.

It is an arithmetic number, because the mean of its divisors is an integer number (2593812).

Almost surely, 2^25139898 is an apocalyptic number.

25139898 is an abundant number, since it is smaller than the sum of its proper divisors (37111590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25139898 is a wasteful number, since it uses less digits than its factorization.

25139898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199538 (or 199535 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 25139898 is about 5013.9702831190. The cubic root of 25139898 is about 292.9461785768.

The spelling of 25139898 in words is "twenty-five million, one hundred thirty-nine thousand, eight hundred ninety-eight".