25039540 has 24 divisors (see below), whose sum is σ = 52881192. Its totient is φ = 9959040.

The previous prime is 25039529. The next prime is 25039559. The reversal of 25039540 is 4593052.

It can be written as a sum of positive squares in 4 ways, for example, as 79524 + 24960016 = 282^2 + 4996^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25039499 and 25039508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 7078.

It is an arithmetic number, because the mean of its divisors is an integer number (2203383).

Almost surely, 2^25039540 is an apocalyptic number.

25039540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25039540 is an abundant number, since it is smaller than the sum of its proper divisors (27841652).

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

25039540 is a wasteful number, since it uses less digits than its factorization.

25039540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107 (or 7105 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25039540 is about 5003.9524378235. The cubic root of 25039540 is about 292.5558468377. Note that the first 3 decimals are identical.

The spelling of 25039540 in words is "twenty-five million, thirty-nine thousand, five hundred forty".