25197990 has 32 divisors (see below), whose sum is σ = 63659520. Its totient is φ = 6365664.

The previous prime is 25197979. The next prime is 25198021. The reversal of 25197990 is 9979152.

It is a Curzon number.

It is a congruent number.

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, 21534 + ... + 22673.

It is an arithmetic number, because the mean of its divisors is an integer number (1989360).

Almost surely, 2^25197990 is an apocalyptic number.

25197990 is an abundant number, since it is smaller than the sum of its proper divisors (38461530).

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

25197990 is a wasteful number, since it uses less digits than its factorization.

25197990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44236.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 25197990 is about 5019.7599544201. The cubic root of 25197990 is about 293.1716467182.

The spelling of 25197990 in words is "twenty-five million, one hundred ninety-seven thousand, nine hundred ninety".