139327921 has 4 divisors (see below), whose sum is σ = 139430772. Its totient is φ = 139225072.

The previous prime is 139327913. The next prime is 139327927. The reversal of 139327921 is 129723931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108680625 + 30647296 = 10425^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 139327921 - 2³ = 139327913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139327927) 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, 49366 + ... + 52111.

It is an arithmetic number, because the mean of its divisors is an integer number (34857693).

Almost surely, 2^139327921 is an apocalyptic number.

It is an amenable number.

139327921 is a deficient number, since it is larger than the sum of its proper divisors (102851).

139327921 is a wasteful number, since it uses less digits than its factorization.

139327921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102850.

The product of its digits is 20412, while the sum is 37.

The square root of 139327921 is about 11803.7248781899. The cubic root of 139327921 is about 518.4171803120.

The spelling of 139327921 in words is "one hundred thirty-nine million, three hundred twenty-seven thousand, nine hundred twenty-one".