25515138 has 32 divisors (see below), whose sum is σ = 58602240. Its totient is φ = 7324560.

The previous prime is 25515121. The next prime is 25515167. The reversal of 25515138 is 83151552.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8920 + ... + 11427.

It is an arithmetic number, because the mean of its divisors is an integer number (1831320).

Almost surely, 2^25515138 is an apocalyptic number.

25515138 is an abundant number, since it is smaller than the sum of its proper divisors (33087102).

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

25515138 is a wasteful number, since it uses less digits than its factorization.

25515138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20382.

The product of its digits is 6000, while the sum is 30.

The square root of 25515138 is about 5051.2511321454. The cubic root of 25515138 is about 294.3964986710.

The spelling of 25515138 in words is "twenty-five million, five hundred fifteen thousand, one hundred thirty-eight".