138543888 has 40 divisors (see below), whose sum is σ = 409035328. Its totient is φ = 39583872.

The previous prime is 138543887. The next prime is 138543901. The reversal of 138543888 is 888345831.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (138543887) 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, 205831 + ... + 206502.

Almost surely, 2^138543888 is an apocalyptic number.

It is an amenable number.

138543888 is an abundant number, since it is smaller than the sum of its proper divisors (270491440).

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

138543888 is a wasteful number, since it uses less digits than its factorization.

138543888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412351 (or 412345 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The square root of 138543888 is about 11770.4667706935. The cubic root of 138543888 is about 517.4429295976.

The spelling of 138543888 in words is "one hundred thirty-eight million, five hundred forty-three thousand, eight hundred eighty-eight".