138729307 has 4 divisors (see below), whose sum is σ = 144761040. Its totient is φ = 132697576.

The previous prime is 138729263. The next prime is 138729319. The reversal of 138729307 is 703927831.

138729307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138729307 - 2²³ = 130340699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138729307.

It is not an unprimeable number, because it can be changed into a prime (138729397) 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, 3015832 + ... + 3015877.

It is an arithmetic number, because the mean of its divisors is an integer number (36190260).

Almost surely, 2^138729307 is an apocalyptic number.

138729307 is a deficient number, since it is larger than the sum of its proper divisors (6031733).

138729307 is an equidigital number, since it uses as much as digits as its factorization.

138729307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6031732.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 138729307 is about 11778.3405877059. The cubic root of 138729307 is about 517.6736650993.

The spelling of 138729307 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, three hundred seven".