25693921 has 16 divisors (see below), whose sum is σ = 29973888. Its totient is φ = 21788800.

The previous prime is 25693907. The next prime is 25693931. The reversal of 25693921 is 12939652.

It is not a de Polignac number, because 25693921 - 2⁷ = 25693793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25693901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9135 + ... + 11611.

It is an arithmetic number, because the mean of its divisors is an integer number (1873368).

Almost surely, 2^25693921 is an apocalyptic number.

It is an amenable number.

25693921 is a deficient number, since it is larger than the sum of its proper divisors (4279967).

25693921 is a wasteful number, since it uses less digits than its factorization.

25693921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552.

The product of its digits is 29160, while the sum is 37.

The square root of 25693921 is about 5068.9171427436. The cubic root of 25693921 is about 295.0825049322.

The spelling of 25693921 in words is "twenty-five million, six hundred ninety-three thousand, nine hundred twenty-one".