138736929 has 4 divisors (see below), whose sum is σ = 184982576. Its totient is φ = 92491284.

The previous prime is 138736909. The next prime is 138736951. The reversal of 138736929 is 929637831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929637831 = 3 ⋅309879277.

It is not a de Polignac number, because 138736929 - 2⁹ = 138736417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138736909) 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 3 ways as a sum of consecutive naturals, for example, 23122819 + ... + 23122824.

It is an arithmetic number, because the mean of its divisors is an integer number (46245644).

Almost surely, 2^138736929 is an apocalyptic number.

It is an amenable number.

138736929 is a deficient number, since it is larger than the sum of its proper divisors (46245647).

138736929 is an equidigital number, since it uses as much as digits as its factorization.

138736929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46245646.

The product of its digits is 489888, while the sum is 48.

The square root of 138736929 is about 11778.6641432719. The cubic root of 138736929 is about 517.6831455196.

It can be divided in two parts, 13873 and 6929, that added together give a palindrome (20802).

The spelling of 138736929 in words is "one hundred thirty-eight million, seven hundred thirty-six thousand, nine hundred twenty-nine".