25930821 has 32 divisors (see below), whose sum is σ = 42375168. Its totient is φ = 13780800.

The previous prime is 25930811. The next prime is 25930873. The reversal of 25930821 is 12803952.

It is a happy number.

It is not a de Polignac number, because 25930821 - 2⁹ = 25930309 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 (25930811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17146 + ... + 18596.

It is an arithmetic number, because the mean of its divisors is an integer number (1324224).

Almost surely, 2^25930821 is an apocalyptic number.

25930821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25930821 is a deficient number, since it is larger than the sum of its proper divisors (16444347).

25930821 is a wasteful number, since it uses less digits than its factorization.

25930821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 25930821 is about 5092.2314362173. The cubic root of 25930821 is about 295.9866266481.

The spelling of 25930821 in words is "twenty-five million, nine hundred thirty thousand, eight hundred twenty-one".