25419987 has 24 divisors (see below), whose sum is σ = 38626224. Its totient is φ = 16702848.

The previous prime is 25419971. The next prime is 25420007. The reversal of 25419987 is 78991452.

It is not a de Polignac number, because 25419987 - 2⁴ = 25419971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25419937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17023 + ... + 18455.

It is an arithmetic number, because the mean of its divisors is an integer number (1609426).

Almost surely, 2^25419987 is an apocalyptic number.

25419987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25419987 is a deficient number, since it is larger than the sum of its proper divisors (13206237).

25419987 is an equidigital number, since it uses as much as digits as its factorization.

25419987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1509 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 25419987 is about 5041.8237771664. The cubic root of 25419987 is about 294.0300885491.

The spelling of 25419987 in words is "twenty-five million, four hundred nineteen thousand, nine hundred eighty-seven".