25858840 has 32 divisors (see below), whose sum is σ = 66494880. Its totient is φ = 8865792.

The previous prime is 25858837. The next prime is 25858841. The reversal of 25858840 is 4885852.

It is a happy number.

It is a super-2 number, since 2×25858840² = 1337359212291200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 25858793 and 25858802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25858841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45897 + ... + 46456.

It is an arithmetic number, because the mean of its divisors is an integer number (2077965).

Almost surely, 2^25858840 is an apocalyptic number.

25858840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25858840 is an abundant number, since it is smaller than the sum of its proper divisors (40636040).

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

25858840 is a wasteful number, since it uses less digits than its factorization.

25858840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92371 (or 92367 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 25858840 is about 5085.1587979138. The cubic root of 25858840 is about 295.7124978082.

The spelling of 25858840 in words is "twenty-five million, eight hundred fifty-eight thousand, eight hundred forty".