138815329 has 6 divisors (see below), whose sum is σ = 139900370. Its totient is φ = 137738640.

The previous prime is 138815323. The next prime is 138815333. The reversal of 138815329 is 923518831.

It can be written as a sum of positive squares in only one way, i.e., 77035729 + 61779600 = 8777^2 + 7860^2 .

It is not a de Polignac number, because 138815329 - 2⁵ = 138815297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138815291 and 138815300.

It is not an unprimeable number, because it can be changed into a prime (138815323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13117 + ... + 21205.

Almost surely, 2^138815329 is an apocalyptic number.

It is an amenable number.

138815329 is a deficient number, since it is larger than the sum of its proper divisors (1085041).

138815329 is an frugal number, since it uses more digits than its factorization.

138815329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8351 (or 8220 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 138815329 is about 11781.9917246618. The cubic root of 138815329 is about 517.7806411089.

The spelling of 138815329 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, three hundred twenty-nine".