25398490 has 32 divisors (see below), whose sum is σ = 50939280. Its totient is φ = 9053184.

The previous prime is 25398487. The next prime is 25398521. The reversal of 25398490 is 9489352.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6640929 + 18757561 = 2577^2 + 4331^2 .

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, 402 + ... + 7138.

Almost surely, 2^25398490 is an apocalyptic number.

25398490 is an abundant number, since it is smaller than the sum of its proper divisors (25540790).

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

25398490 is a wasteful number, since it uses less digits than its factorization.

25398490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 25398490 is about 5039.6914588098. The cubic root of 25398490 is about 293.9471807251.

The spelling of 25398490 in words is "twenty-five million, three hundred ninety-eight thousand, four hundred ninety".