138907028 has 96 divisors (see below), whose sum is σ = 291008256. Its totient is φ = 57480192.

The previous prime is 138907003. The next prime is 138907031. The reversal of 138907028 is 820709831.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138906982 and 138907000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1902800 + ... + 1902872.

It is an arithmetic number, because the mean of its divisors is an integer number (3031336).

Almost surely, 2^138907028 is an apocalyptic number.

It is an amenable number.

138907028 is an abundant number, since it is smaller than the sum of its proper divisors (152101228).

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

138907028 is a wasteful number, since it uses less digits than its factorization.

138907028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 138907028 is about 11785.8825719587. The cubic root of 138907028 is about 517.8946283185.

The spelling of 138907028 in words is "one hundred thirty-eight million, nine hundred seven thousand, twenty-eight".