13639723 has 4 divisors (see below), whose sum is σ = 13658920. Its totient is φ = 13620528.

The previous prime is 13639697. The next prime is 13639727. The reversal of 13639723 is 32793631.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13639723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13639727) 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, 8490 + ... + 9967.

It is an arithmetic number, because the mean of its divisors is an integer number (3414730).

Almost surely, 2^13639723 is an apocalyptic number.

13639723 is a deficient number, since it is larger than the sum of its proper divisors (19197).

13639723 is an equidigital number, since it uses as much as digits as its factorization.

13639723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19196.

The product of its digits is 20412, while the sum is 34.

The square root of 13639723 is about 3693.1995613560. The cubic root of 13639723 is about 238.9288082399.

The spelling of 13639723 in words is "thirteen million, six hundred thirty-nine thousand, seven hundred twenty-three".