138994136 has 16 divisors (see below), whose sum is σ = 261366000. Its totient is φ = 69296544.

The previous prime is 138994133. The next prime is 138994171. The reversal of 138994136 is 631499831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138994133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22100 + ... + 27683.

It is an arithmetic number, because the mean of its divisors is an integer number (16335375).

Almost surely, 2^138994136 is an apocalyptic number.

It is an amenable number.

138994136 is a deficient number, since it is larger than the sum of its proper divisors (122371864).

138994136 is a wasteful number, since it uses less digits than its factorization.

138994136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50138 (or 50134 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 138994136 is about 11789.5774309345. The cubic root of 138994136 is about 518.0028621955.

The spelling of 138994136 in words is "one hundred thirty-eight million, nine hundred ninety-four thousand, one hundred thirty-six".