25917975 has 30 divisors (see below), whose sum is σ = 48012800. Its totient is φ = 13821840.

The previous prime is 25917971. The next prime is 25918001. The reversal of 25917975 is 57971952.

It is not a de Polignac number, because 25917975 - 2² = 25917971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 25917975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25917971) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4375 + ... + 8424.

Almost surely, 2^25917975 is an apocalyptic number.

25917975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25917975 is a deficient number, since it is larger than the sum of its proper divisors (22094825).

25917975 is a wasteful number, since it uses less digits than its factorization.

25917975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12821 (or 12807 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 25917975 is about 5090.9699468765. The cubic root of 25917975 is about 295.9377418062.

The spelling of 25917975 in words is "twenty-five million, nine hundred seventeen thousand, nine hundred seventy-five".