138744888 has 32 divisors (see below), whose sum is σ = 367266960. Its totient is φ = 43527680.

The previous prime is 138744847. The next prime is 138744889. The reversal of 138744888 is 888447831.

It is a super-2 number, since 2×138744888² = 38500287892265088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 138744888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138744889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169623 + ... + 170438.

Almost surely, 2^138744888 is an apocalyptic number.

It is an amenable number.

138744888 is an abundant number, since it is smaller than the sum of its proper divisors (228522072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138744888 is a wasteful number, since it uses less digits than its factorization.

138744888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340087 (or 340083 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 51.

The square root of 138744888 is about 11779.0019950758. The cubic root of 138744888 is about 517.6930447378.

The spelling of 138744888 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, eight hundred eighty-eight".