139173929 has 16 divisors (see below), whose sum is σ = 148262400. Its totient is φ = 130413696.

The previous prime is 139173901. The next prime is 139173949. The reversal of 139173929 is 929371931.

It is not a de Polignac number, because 139173929 - 2²⁰ = 138125353 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 139173929.

It is not an unprimeable number, because it can be changed into a prime (139173949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290312 + ... + 290790.

It is an arithmetic number, because the mean of its divisors is an integer number (9266400).

Almost surely, 2^139173929 is an apocalyptic number.

It is an amenable number.

139173929 is a deficient number, since it is larger than the sum of its proper divisors (9088471).

139173929 is a wasteful number, since it uses less digits than its factorization.

139173929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

The product of its digits is 91854, while the sum is 44.

The square root of 139173929 is about 11797.2000491642. The cubic root of 139173929 is about 518.2261166033.

The spelling of 139173929 in words is "one hundred thirty-nine million, one hundred seventy-three thousand, nine hundred twenty-nine".