138293729 has 24 divisors (see below), whose sum is σ = 164947968. Its totient is φ = 115577280.

The previous prime is 138293711. The next prime is 138293731. The reversal of 138293729 is 927392831.

It is a happy number.

It is not a de Polignac number, because 138293729 - 2⁸ = 138293473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138293729.

It is not an unprimeable number, because it can be changed into a prime (138290729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441677 + ... + 441989.

It is an arithmetic number, because the mean of its divisors is an integer number (6872832).

Almost surely, 2^138293729 is an apocalyptic number.

It is an amenable number.

138293729 is a deficient number, since it is larger than the sum of its proper divisors (26654239).

138293729 is a wasteful number, since it uses less digits than its factorization.

138293729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 518 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 138293729 is about 11759.8354155150. The cubic root of 138293729 is about 517.1313051377.

The spelling of 138293729 in words is "one hundred thirty-eight million, two hundred ninety-three thousand, seven hundred twenty-nine".