25405998 has 16 divisors (see below), whose sum is σ = 51571200. Its totient is φ = 8342136.

The previous prime is 25405987. The next prime is 25406011. The reversal of 25405998 is 89950452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31198 + ... + 32001.

It is an arithmetic number, because the mean of its divisors is an integer number (3223200).

Almost surely, 2^25405998 is an apocalyptic number.

25405998 is an abundant number, since it is smaller than the sum of its proper divisors (26165202).

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

25405998 is a wasteful number, since it uses less digits than its factorization.

25405998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63271.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 25405998 is about 5040.4362906399. The cubic root of 25405998 is about 293.9761422632.

The spelling of 25405998 in words is "twenty-five million, four hundred five thousand, nine hundred ninety-eight".