138144988 has 12 divisors (see below), whose sum is σ = 241895920. Its totient is φ = 69031872.

The previous prime is 138144983. The next prime is 138144989. The reversal of 138144988 is 889441831.

It is a super-3 number, since 3×138144988³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138144983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1728 + ... + 16711.

Almost surely, 2^138144988 is an apocalyptic number.

It is an amenable number.

138144988 is a deficient number, since it is larger than the sum of its proper divisors (103750932).

138144988 is a wasteful number, since it uses less digits than its factorization.

138144988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20316 (or 20314 counting only the distinct ones).

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

The square root of 138144988 is about 11753.5096035184. The cubic root of 138144988 is about 516.9458394603.

The spelling of 138144988 in words is "one hundred thirty-eight million, one hundred forty-four thousand, nine hundred eighty-eight".