138890525 has 12 divisors (see below), whose sum is σ = 173807700. Its totient is φ = 110090880.

The previous prime is 138890503. The next prime is 138890533. The reversal of 138890525 is 525098831.

It can be written as a sum of positive squares in 6 ways, for example, as 7513081 + 131377444 = 2741^2 + 11462^2 .

It is not a de Polignac number, because 138890525 - 2⁶ = 138890461 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 22760 + ... + 28209.

It is an arithmetic number, because the mean of its divisors is an integer number (14483975).

Almost surely, 2^138890525 is an apocalyptic number.

It is an amenable number.

138890525 is a deficient number, since it is larger than the sum of its proper divisors (34917175).

138890525 is a wasteful number, since it uses less digits than its factorization.

138890525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51088 (or 51083 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 138890525 is about 11785.1824338871. The cubic root of 138890525 is about 517.8741178287.

The spelling of 138890525 in words is "one hundred thirty-eight million, eight hundred ninety thousand, five hundred twenty-five".