138491884 has 12 divisors (see below), whose sum is σ = 242461408. Its totient is φ = 69217200.

The previous prime is 138491879. The next prime is 138491887. The reversal of 138491884 is 488194831.

It is not an unprimeable number, because it can be changed into a prime (138491887) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6589 + ... + 17899.

Almost surely, 2^138491884 is an apocalyptic number.

It is an amenable number.

138491884 is a deficient number, since it is larger than the sum of its proper divisors (103969524).

138491884 is a wasteful number, since it uses less digits than its factorization.

138491884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376 (or 14374 counting only the distinct ones).

The product of its digits is 221184, while the sum is 46.

The square root of 138491884 is about 11768.2574750895. The cubic root of 138491884 is about 517.3781788290.

The spelling of 138491884 in words is "one hundred thirty-eight million, four hundred ninety-one thousand, eight hundred eighty-four".