138129713 has 4 divisors (see below), whose sum is σ = 140735988. Its totient is φ = 135523440.

The previous prime is 138129703. The next prime is 138129737. The reversal of 138129713 is 317921831.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126067984 + 12061729 = 11228^2 + 3473^2 .

It is a cyclic number.

It is not a de Polignac number, because 138129713 - 2¹⁴ = 138113329 is a prime.

It is a super-2 number, since 2×138129713² = 38159635226924738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138129703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303058 + ... + 1303163.

It is an arithmetic number, because the mean of its divisors is an integer number (35183997).

Almost surely, 2^138129713 is an apocalyptic number.

It is an amenable number.

138129713 is a deficient number, since it is larger than the sum of its proper divisors (2606275).

138129713 is an equidigital number, since it uses as much as digits as its factorization.

138129713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606274.

The product of its digits is 9072, while the sum is 35.

The square root of 138129713 is about 11752.8597796451. The cubic root of 138129713 is about 516.9267854725.

The spelling of 138129713 in words is "one hundred thirty-eight million, one hundred twenty-nine thousand, seven hundred thirteen".