138662740 has 12 divisors (see below), whose sum is σ = 291191796. Its totient is φ = 55465088.

The previous prime is 138662683. The next prime is 138662743. The reversal of 138662740 is 47266831.

138662740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43639236 + 95023504 = 6606^2 + 9748^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138662740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138662743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3466549 + ... + 3466588.

It is an arithmetic number, because the mean of its divisors is an integer number (24265983).

Almost surely, 2^138662740 is an apocalyptic number.

138662740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138662740 is an abundant number, since it is smaller than the sum of its proper divisors (152529056).

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

138662740 is a wasteful number, since it uses less digits than its factorization.

138662740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6933146 (or 6933144 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 138662740 is about 11775.5144261302. The cubic root of 138662740 is about 517.5908527584.

The spelling of 138662740 in words is "one hundred thirty-eight million, six hundred sixty-two thousand, seven hundred forty".