138433929 has 4 divisors (see below), whose sum is σ = 184578576. Its totient is φ = 92289284.

The previous prime is 138433913. The next prime is 138433961. The reversal of 138433929 is 929334831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138433929 - 2⁴ = 138433913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138433969) 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, 23072319 + ... + 23072324.

It is an arithmetic number, because the mean of its divisors is an integer number (46144644).

Almost surely, 2^138433929 is an apocalyptic number.

It is an amenable number.

138433929 is a deficient number, since it is larger than the sum of its proper divisors (46144647).

138433929 is an equidigital number, since it uses as much as digits as its factorization.

138433929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46144646.

The product of its digits is 139968, while the sum is 42.

The square root of 138433929 is about 11765.7948732757. The cubic root of 138433929 is about 517.3059993023.

The spelling of 138433929 in words is "one hundred thirty-eight million, four hundred thirty-three thousand, nine hundred twenty-nine".