138931330 has 8 divisors (see below), whose sum is σ = 250076412. Its totient is φ = 55572528.

The previous prime is 138931321. The next prime is 138931333. The reversal of 138931330 is 33139831.

138931330 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 137569441 + 1361889 = 11729^2 + 1167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 138931292 and 138931301.

It is not an unprimeable number, because it can be changed into a prime (138931333) 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, 6946557 + ... + 6946576.

Almost surely, 2^138931330 is an apocalyptic number.

138931330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138931330 is a deficient number, since it is larger than the sum of its proper divisors (111145082).

138931330 is a wasteful number, since it uses less digits than its factorization.

138931330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893140.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 138931330 is about 11786.9135060880. The cubic root of 138931330 is about 517.9248287135.

The spelling of 138931330 in words is "one hundred thirty-eight million, nine hundred thirty-one thousand, three hundred thirty".