138473929 has 16 divisors (see below), whose sum is σ = 154047744. Its totient is φ = 123424000.

The previous prime is 138473899. The next prime is 138473947. The reversal of 138473929 is 929374831.

It is a cyclic number.

It is not a de Polignac number, because 138473929 - 2¹³ = 138465737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138473989) 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 15 ways as a sum of consecutive naturals, for example, 124992 + ... + 126094.

It is an arithmetic number, because the mean of its divisors is an integer number (9627984).

Almost surely, 2^138473929 is an apocalyptic number.

It is an amenable number.

138473929 is a deficient number, since it is larger than the sum of its proper divisors (15573815).

138473929 is a wasteful number, since it uses less digits than its factorization.

138473929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328.

The product of its digits is 326592, while the sum is 46.

The square root of 138473929 is about 11767.4945931579. The cubic root of 138473929 is about 517.3558190911.

The spelling of 138473929 in words is "one hundred thirty-eight million, four hundred seventy-three thousand, nine hundred twenty-nine".