25139456 has 36 divisors (see below), whose sum is σ = 50503152. Its totient is φ = 12489216.

The previous prime is 25139453. The next prime is 25139479. The reversal of 25139456 is 65493152.

It is not an unprimeable number, because it can be changed into a prime (25139453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72275 + ... + 72621.

Almost surely, 2^25139456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25139456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25251576).

25139456 is an abundant number, since it is smaller than the sum of its proper divisors (25363696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25139456 is an equidigital number, since it uses as much as digits as its factorization.

25139456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 632 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 25139456 is about 5013.9262060784. The cubic root of 25139456 is about 292.9444617444.

The spelling of 25139456 in words is "twenty-five million, one hundred thirty-nine thousand, four hundred fifty-six".