25540905 has 32 divisors (see below), whose sum is σ = 44279424. Its totient is φ = 12496896.

The previous prime is 25540897. The next prime is 25540913. The reversal of 25540905 is 50904552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25540897) and next prime (25540913).

It is not a de Polignac number, because 25540905 - 2³ = 25540897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43977 + ... + 44553.

It is an arithmetic number, because the mean of its divisors is an integer number (1383732).

Almost surely, 2^25540905 is an apocalyptic number.

It is an amenable number.

25540905 is a deficient number, since it is larger than the sum of its proper divisors (18738519).

25540905 is a wasteful number, since it uses less digits than its factorization.

25540905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25540905 is about 5053.8010447583. The cubic root of 25540905 is about 294.4955661669.

The spelling of 25540905 in words is "twenty-five million, five hundred forty thousand, nine hundred five".