25440138 has 12 divisors (see below), whose sum is σ = 55120338. Its totient is φ = 8480040.

The previous prime is 25440091. The next prime is 25440167. The reversal of 25440138 is 83104452.

25440138 is a `hidden beast` number, since 254 + 401 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23357889 + 2082249 = 4833^2 + 1443^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 706653 + ... + 706688.

Almost surely, 2^25440138 is an apocalyptic number.

25440138 is an abundant number, since it is smaller than the sum of its proper divisors (29680200).

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

25440138 is a wasteful number, since it uses less digits than its factorization.

25440138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413349 (or 1413346 counting only the distinct ones).

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

The square root of 25440138 is about 5043.8217652887. The cubic root of 25440138 is about 294.1077628004.

The spelling of 25440138 in words is "twenty-five million, four hundred forty thousand, one hundred thirty-eight".