25019939 has 6 divisors (see below), whose sum is σ = 29104884. Its totient is φ = 21445620.

The previous prime is 25019921. The next prime is 25019957. The reversal of 25019939 is 93991052.

It is an interprime number because it is at equal distance from previous prime (25019921) and next prime (25019957).

It is not a de Polignac number, because 25019939 - 2¹⁶ = 24954403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25019909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255257 + ... + 255354.

It is an arithmetic number, because the mean of its divisors is an integer number (4850814).

Almost surely, 2^25019939 is an apocalyptic number.

25019939 is a deficient number, since it is larger than the sum of its proper divisors (4084945).

25019939 is an equidigital number, since it uses as much as digits as its factorization.

25019939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510625 (or 510618 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 25019939 is about 5001.9935025947. The cubic root of 25019939 is about 292.4794891503.

The spelling of 25019939 in words is "twenty-five million, nineteen thousand, nine hundred thirty-nine".