138533884 has 18 divisors (see below), whose sum is σ = 257536160. Its totient is φ = 65191872.

The previous prime is 138533881. The next prime is 138533909. The reversal of 138533884 is 488335831.

It is a super-2 number, since 2×138533884² = 38383274032250912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138533884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138533881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58764 + ... + 61075.

Almost surely, 2^138533884 is an apocalyptic number.

It is an amenable number.

138533884 is a deficient number, since it is larger than the sum of its proper divisors (119002276).

138533884 is a wasteful number, since it uses less digits than its factorization.

138533884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119877 (or 119858 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The square root of 138533884 is about 11770.0418011152. The cubic root of 138533884 is about 517.4304747629.

The spelling of 138533884 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, eight hundred eighty-four".