138406056 has 16 divisors (see below), whose sum is σ = 346015200. Its totient is φ = 46135344.

The previous prime is 138406043. The next prime is 138406063. The reversal of 138406056 is 650604831.

138406056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883436 + ... + 2883483.

It is an arithmetic number, because the mean of its divisors is an integer number (21625950).

Almost surely, 2^138406056 is an apocalyptic number.

It is an amenable number.

138406056 is an abundant number, since it is smaller than the sum of its proper divisors (207609144).

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

138406056 is a wasteful number, since it uses less digits than its factorization.

138406056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766928 (or 5766924 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 138406056 is about 11764.6103207884. The cubic root of 138406056 is about 517.2712779542.

The spelling of 138406056 in words is "one hundred thirty-eight million, four hundred six thousand, fifty-six".