139623317 has 4 divisors (see below), whose sum is σ = 145693920. Its totient is φ = 133552716.

The previous prime is 139623299. The next prime is 139623389. The reversal of 139623317 is 713326931.

139623317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 713326931 = 2719 ⋅262349.

It is a cyclic number.

It is not a de Polignac number, because 139623317 - 2¹⁰ = 139622293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139623917) 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, 3035267 + ... + 3035312.

It is an arithmetic number, because the mean of its divisors is an integer number (36423480).

Almost surely, 2^139623317 is an apocalyptic number.

It is an amenable number.

139623317 is a deficient number, since it is larger than the sum of its proper divisors (6070603).

139623317 is an equidigital number, since it uses as much as digits as its factorization.

139623317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070602.

The product of its digits is 20412, while the sum is 35.

The square root of 139623317 is about 11816.2310827099. The cubic root of 139623317 is about 518.7832956420.

The spelling of 139623317 in words is "one hundred thirty-nine million, six hundred twenty-three thousand, three hundred seventeen".