139639223 has 4 divisors (see below), whose sum is σ = 139828920. Its totient is φ = 139449528.

The previous prime is 139639219. The next prime is 139639229. The reversal of 139639223 is 322936931.

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

It is a cyclic number.

It is not a de Polignac number, because 139639223 - 2² = 139639219 is a prime.

It is a super-2 number, since 2×139639223² = 38998225200087458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139639229) 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, 93740 + ... + 95217.

It is an arithmetic number, because the mean of its divisors is an integer number (34957230).

Almost surely, 2^139639223 is an apocalyptic number.

139639223 is a deficient number, since it is larger than the sum of its proper divisors (189697).

139639223 is an equidigital number, since it uses as much as digits as its factorization.

139639223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189696.

The product of its digits is 52488, while the sum is 38.

The square root of 139639223 is about 11816.9041207924. The cubic root of 139639223 is about 518.8029949633.

The spelling of 139639223 in words is "one hundred thirty-nine million, six hundred thirty-nine thousand, two hundred twenty-three".