138820525 has 24 divisors (see below), whose sum is σ = 181131264. Its totient is φ = 105336000.

The previous prime is 138820481. The next prime is 138820531. The reversal of 138820525 is 525028831.

138820525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138820525 - 2⁷ = 138820397 is a prime.

It is a super-2 number, since 2×138820525² = 38542276322551250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72075 + ... + 73975.

It is an arithmetic number, because the mean of its divisors is an integer number (7547136).

Almost surely, 2^138820525 is an apocalyptic number.

It is an amenable number.

138820525 is a deficient number, since it is larger than the sum of its proper divisors (42310739).

138820525 is a wasteful number, since it uses less digits than its factorization.

138820525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 138820525 is about 11782.2122286097. The cubic root of 138820525 is about 517.7871013816.

The spelling of 138820525 in words is "one hundred thirty-eight million, eight hundred twenty thousand, five hundred twenty-five".