138705538 has 16 divisors (see below), whose sum is σ = 210790944. Its totient is φ = 68446080.

The previous prime is 138705527. The next prime is 138705547. The reversal of 138705538 is 835507831.

It is a self number, because there is not a number n which added to its sum of digits gives 138705538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89833 + ... + 91363.

It is an arithmetic number, because the mean of its divisors is an integer number (13174434).

Almost surely, 2^138705538 is an apocalyptic number.

138705538 is a deficient number, since it is larger than the sum of its proper divisors (72085406).

138705538 is a wasteful number, since it uses less digits than its factorization.

138705538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 138705538 is about 11777.3315313784. The cubic root of 138705538 is about 517.6440984360.

The spelling of 138705538 in words is "one hundred thirty-eight million, seven hundred five thousand, five hundred thirty-eight".