25239840 has 48 divisors (see below), whose sum is σ = 79507008. Its totient is φ = 6730496.

The previous prime is 25239833. The next prime is 25239869. The reversal of 25239840 is 4893252.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25812 + ... + 26771.

It is an arithmetic number, because the mean of its divisors is an integer number (1656396).

Almost surely, 2^25239840 is an apocalyptic number.

25239840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25239840 is an abundant number, since it is smaller than the sum of its proper divisors (54267168).

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

25239840 is a wasteful number, since it uses less digits than its factorization.

25239840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52601 (or 52593 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 25239840 is about 5023.9267510584. The cubic root of 25239840 is about 293.3338613397. Note that the first 3 decimals are identical.

The spelling of 25239840 in words is "twenty-five million, two hundred thirty-nine thousand, eight hundred forty".