138660312 has 64 divisors (see below), whose sum is σ = 406897920. Its totient is φ = 38544768.

The previous prime is 138660311. The next prime is 138660331. The reversal of 138660312 is 213066831.

It is a self number, because there is not a number n which added to its sum of digits gives 138660312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138660311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4938 + ... + 17369.

It is an arithmetic number, because the mean of its divisors is an integer number (6357780).

Almost surely, 2^138660312 is an apocalyptic number.

138660312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138660312 is an abundant number, since it is smaller than the sum of its proper divisors (268237608).

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

138660312 is a wasteful number, since it uses less digits than its factorization.

138660312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22360 (or 22356 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 138660312 is about 11775.4113303952. The cubic root of 138660312 is about 517.5878317163.

The spelling of 138660312 in words is "one hundred thirty-eight million, six hundred sixty thousand, three hundred twelve".