25138440 has 48 divisors (see below), whose sum is σ = 81701100. Its totient is φ = 6703488.

The previous prime is 25138439. The next prime is 25138481. The reversal of 25138440 is 4483152.

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 3849444 = 4614^2 + 1962^2 .

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 11 ways as a sum of consecutive naturals, for example, 34555 + ... + 35274.

Almost surely, 2^25138440 is an apocalyptic number.

25138440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25138440 is an abundant number, since it is smaller than the sum of its proper divisors (56562660).

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

25138440 is a wasteful number, since it uses less digits than its factorization.

25138440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69846 (or 69839 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 25138440 is about 5013.8248872493. The cubic root of 25138440 is about 292.9405152843.

The spelling of 25138440 in words is "twenty-five million, one hundred thirty-eight thousand, four hundred forty".