25387971 has 16 divisors (see below), whose sum is σ = 40723200. Its totient is φ = 13743648.

The previous prime is 25387949. The next prime is 25388003. The reversal of 25387971 is 17978352.

It is not a de Polignac number, because 25387971 - 2¹¹ = 25385923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25387471) 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, 31416 + ... + 32213.

It is an arithmetic number, because the mean of its divisors is an integer number (2545200).

Almost surely, 2^25387971 is an apocalyptic number.

25387971 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25387971 is a deficient number, since it is larger than the sum of its proper divisors (15335229).

25387971 is a wasteful number, since it uses less digits than its factorization.

25387971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63658.

The product of its digits is 105840, while the sum is 42.

The square root of 25387971 is about 5038.6477352560. The cubic root of 25387971 is about 293.9065948825.

The spelling of 25387971 in words is "twenty-five million, three hundred eighty-seven thousand, nine hundred seventy-one".