138733828 has 12 divisors (see below), whose sum is σ = 242927692. Its totient is φ = 69325920.

The previous prime is 138733741. The next prime is 138733849. The reversal of 138733828 is 828337831.

It can be written as a sum of positive squares in 2 ways, for example, as 248004 + 138485824 = 498^2 + 11768^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875 + ... + 16762.

Almost surely, 2^138733828 is an apocalyptic number.

It is an amenable number.

138733828 is a deficient number, since it is larger than the sum of its proper divisors (104193864).

138733828 is a wasteful number, since it uses less digits than its factorization.

138733828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20502 (or 20500 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 138733828 is about 11778.5325062166. The cubic root of 138733828 is about 517.6792884659.

The spelling of 138733828 in words is "one hundred thirty-eight million, seven hundred thirty-three thousand, eight hundred twenty-eight".