138218672 has 40 divisors (see below), whose sum is σ = 271982592. Its totient is φ = 68040000.

The previous prime is 138218671. The next prime is 138218699. The reversal of 138218672 is 276812831.

It is not an unprimeable number, because it can be changed into a prime (138218671) 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 7 ways as a sum of consecutive naturals, for example, 509897 + ... + 510167.

Almost surely, 2^138218672 is an apocalyptic number.

It is an amenable number.

138218672 is a deficient number, since it is larger than the sum of its proper divisors (133763920).

138218672 is a wasteful number, since it uses less digits than its factorization.

138218672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 651 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 138218672 is about 11756.6437387547. The cubic root of 138218672 is about 517.0377329304.

The spelling of 138218672 in words is "one hundred thirty-eight million, two hundred eighteen thousand, six hundred seventy-two".