138552928 has 24 divisors (see below), whose sum is σ = 274216320. Its totient is φ = 68910720.

The previous prime is 138552917. The next prime is 138552929. The reversal of 138552928 is 829255831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138552929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5223 + ... + 17446.

It is an arithmetic number, because the mean of its divisors is an integer number (11425680).

Almost surely, 2^138552928 is an apocalyptic number.

It is an amenable number.

138552928 is a deficient number, since it is larger than the sum of its proper divisors (135663392).

138552928 is a wasteful number, since it uses less digits than its factorization.

138552928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22870 (or 22862 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The square root of 138552928 is about 11770.8507763883. The cubic root of 138552928 is about 517.4541837506.

The spelling of 138552928 in words is "one hundred thirty-eight million, five hundred fifty-two thousand, nine hundred twenty-eight".