25804989 has 48 divisors (see below), whose sum is σ = 44821504. Its totient is φ = 13996800.

The previous prime is 25804981. The next prime is 25804993. The reversal of 25804989 is 98940852.

It is not a de Polignac number, because 25804989 - 2³ = 25804981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25804981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142479 + ... + 142659.

Almost surely, 2^25804989 is an apocalyptic number.

It is an amenable number.

25804989 is a deficient number, since it is larger than the sum of its proper divisors (19016515).

25804989 is a wasteful number, since it uses less digits than its factorization.

25804989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 25804989 is about 5079.8611201489. The cubic root of 25804989 is about 295.5070815210.

It can be divided in two parts, 2580 and 4989, that added together give a square (7569 = 87²).

The spelling of 25804989 in words is "twenty-five million, eight hundred four thousand, nine hundred eighty-nine".