138729313 has 4 divisors (see below), whose sum is σ = 138776260. Its totient is φ = 138682368.

The previous prime is 138729263. The next prime is 138729319. The reversal of 138729313 is 313927831.

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 50594769 + 88134544 = 7113^2 + 9388^2 .

It is a cyclic number.

It is not a de Polignac number, because 138729313 - 2²¹ = 136632161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138729319) 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, 18720 + ... + 25057.

It is an arithmetic number, because the mean of its divisors is an integer number (34694065).

Almost surely, 2^138729313 is an apocalyptic number.

It is an amenable number.

138729313 is a deficient number, since it is larger than the sum of its proper divisors (46947).

138729313 is an equidigital number, since it uses as much as digits as its factorization.

138729313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46946.

The product of its digits is 27216, while the sum is 37.

The square root of 138729313 is about 11778.3408424107. The cubic root of 138729313 is about 517.6736725624.

The spelling of 138729313 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, three hundred thirteen".