138041918 has 24 divisors (see below), whose sum is σ = 241346664. Its totient is φ = 59043600.

The previous prime is 138041903. The next prime is 138041927. The reversal of 138041918 is 819140831.

138041918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138041918² = 38111142250237448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63713 + ... + 65843.

It is an arithmetic number, because the mean of its divisors is an integer number (10056111).

Almost surely, 2^138041918 is an apocalyptic number.

138041918 is a deficient number, since it is larger than the sum of its proper divisors (103304746).

138041918 is a wasteful number, since it uses less digits than its factorization.

138041918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 138041918 is about 11749.1241375687. The cubic root of 138041918 is about 516.8172430123.

The spelling of 138041918 in words is "one hundred thirty-eight million, forty-one thousand, nine hundred eighteen".