25953921 has 12 divisors (see below), whose sum is σ = 42844672. Its totient is φ = 14830776.

The previous prime is 25953919. The next prime is 25953929. The reversal of 25953921 is 12935952.

It is a happy number.

It is not a de Polignac number, because 25953921 - 2¹ = 25953919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25953929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205921 + ... + 206046.

Almost surely, 2^25953921 is an apocalyptic number.

25953921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25953921 is a deficient number, since it is larger than the sum of its proper divisors (16890751).

25953921 is a wasteful number, since it uses less digits than its factorization.

25953921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411980 (or 411977 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 25953921 is about 5094.4990921581. The cubic root of 25953921 is about 296.0744919955.

It can be divided in two parts, 259539 and 21, that added together give a triangular number (259560 = T₇₂₀).

The spelling of 25953921 in words is "twenty-five million, nine hundred fifty-three thousand, nine hundred twenty-one".