25908921 has 6 divisors (see below), whose sum is σ = 37424010. Its totient is φ = 17272608.

The previous prime is 25908907. The next prime is 25908937. The reversal of 25908921 is 12980952.

It can be written as a sum of positive squares in only one way, i.e., 23765625 + 2143296 = 4875^2 + 1464^2 .

It is not a de Polignac number, because 25908921 - 2⁷ = 25908793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25908721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1439376 + ... + 1439393.

It is an arithmetic number, because the mean of its divisors is an integer number (6237335).

Almost surely, 2^25908921 is an apocalyptic number.

It is an amenable number.

25908921 is a deficient number, since it is larger than the sum of its proper divisors (11515089).

25908921 is a wasteful number, since it uses less digits than its factorization.

25908921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878775 (or 2878772 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 25908921 is about 5090.0806476912. The cubic root of 25908921 is about 295.9032775348.

It can be divided in two parts, 2590 and 8921, that added together give a palindrome (11511).

The spelling of 25908921 in words is "twenty-five million, nine hundred eight thousand, nine hundred twenty-one".