138855740 has 12 divisors (see below), whose sum is σ = 291597096. Its totient is φ = 55542288.

The previous prime is 138855721. The next prime is 138855757. The reversal of 138855740 is 47558831.

It is a congruent number.

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, 3471374 + ... + 3471413.

It is an arithmetic number, because the mean of its divisors is an integer number (24299758).

Almost surely, 2^138855740 is an apocalyptic number.

138855740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138855740 is an abundant number, since it is smaller than the sum of its proper divisors (152741356).

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

138855740 is a wasteful number, since it uses less digits than its factorization.

138855740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6942796 (or 6942794 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 138855740 is about 11783.7065476021. The cubic root of 138855740 is about 517.8308805254.

The spelling of 138855740 in words is "one hundred thirty-eight million, eight hundred fifty-five thousand, seven hundred forty".