138503729 has 8 divisors (see below), whose sum is σ = 170466240. Its totient is φ = 109585296.

The previous prime is 138503719. The next prime is 138503741. The reversal of 138503729 is 927305831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138503729 - 2⁴ = 138503713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138503692 and 138503701.

It is not an unprimeable number, because it can be changed into a prime (138503719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760919 + ... + 761100.

It is an arithmetic number, because the mean of its divisors is an integer number (21308280).

Almost surely, 2^138503729 is an apocalyptic number.

It is an amenable number.

138503729 is a deficient number, since it is larger than the sum of its proper divisors (31962511).

138503729 is a wasteful number, since it uses less digits than its factorization.

138503729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522039.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 138503729 is about 11768.7607249022. The cubic root of 138503729 is about 517.3929285979.

The spelling of 138503729 in words is "one hundred thirty-eight million, five hundred three thousand, seven hundred twenty-nine".