139623313 has 4 divisors (see below), whose sum is σ = 144437940. Its totient is φ = 134808688.

The previous prime is 139623299. The next prime is 139623389. The reversal of 139623313 is 313326931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313326931 = 109 ⋅2874559.

It can be written as a sum of positive squares in 2 ways, for example, as 118984464 + 20638849 = 10908^2 + 4543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139623313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139623013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2407270 + ... + 2407327.

It is an arithmetic number, because the mean of its divisors is an integer number (36109485).

Almost surely, 2^139623313 is an apocalyptic number.

It is an amenable number.

139623313 is a deficient number, since it is larger than the sum of its proper divisors (4814627).

139623313 is an equidigital number, since it uses as much as digits as its factorization.

139623313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814626.

The product of its digits is 8748, while the sum is 31.

The square root of 139623313 is about 11816.2309134512. The cubic root of 139623313 is about 518.7832906878.

The spelling of 139623313 in words is "one hundred thirty-nine million, six hundred twenty-three thousand, three hundred thirteen".