25439456 has 36 divisors (see below), whose sum is σ = 57409128. Its totient is φ = 10870272.

The previous prime is 25439413. The next prime is 25439459. The reversal of 25439456 is 65493452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25439459) 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, 75320 + ... + 75656.

It is an arithmetic number, because the mean of its divisors is an integer number (1594698).

Almost surely, 2^25439456 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 25439456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28704564).

25439456 is an abundant number, since it is smaller than the sum of its proper divisors (31969672).

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

25439456 is an frugal number, since it uses more digits than its factorization.

25439456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 346 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 25439456 is about 5043.7541573713. The cubic root of 25439456 is about 294.1051346269.

The spelling of 25439456 in words is "twenty-five million, four hundred thirty-nine thousand, four hundred fifty-six".