138312730 has 16 divisors (see below), whose sum is σ = 249156000. Its totient is φ = 55282192.

The previous prime is 138312703. The next prime is 138312743. The reversal of 138312730 is 37213831.

138312730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138312730² = 38260822560105800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10377 + ... + 19603.

It is an arithmetic number, because the mean of its divisors is an integer number (15572250).

Almost surely, 2^138312730 is an apocalyptic number.

138312730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138312730 is a deficient number, since it is larger than the sum of its proper divisors (110843270).

138312730 is a wasteful number, since it uses less digits than its factorization.

138312730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 138312730 is about 11760.6432647198. The cubic root of 138312730 is about 517.1549879709.

It can be divided in two parts, 13831 and 2730, that added together give a palindrome (16561).

The spelling of 138312730 in words is "one hundred thirty-eight million, three hundred twelve thousand, seven hundred thirty".