138237740 has 12 divisors (see below), whose sum is σ = 290299296. Its totient is φ = 55295088.

The previous prime is 138237739. The next prime is 138237769. The reversal of 138237740 is 47732831.

138237740 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138237740.

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, 3455924 + ... + 3455963.

It is an arithmetic number, because the mean of its divisors is an integer number (24191608).

Almost surely, 2^138237740 is an apocalyptic number.

138237740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138237740 is an abundant number, since it is smaller than the sum of its proper divisors (152061556).

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

138237740 is a wasteful number, since it uses less digits than its factorization.

138237740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911896 (or 6911894 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 138237740 is about 11757.4546565147. The cubic root of 138237740 is about 517.0615078710.

The spelling of 138237740 in words is "one hundred thirty-eight million, two hundred thirty-seven thousand, seven hundred forty".