13639823 has 4 divisors (see below), whose sum is σ = 13930080. Its totient is φ = 13349568.

The previous prime is 13639819. The next prime is 13639837. The reversal of 13639823 is 32893631.

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 13639823 - 2² = 13639819 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 (13639523) 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, 145058 + ... + 145151.

It is an arithmetic number, because the mean of its divisors is an integer number (3482520).

Almost surely, 2^13639823 is an apocalyptic number.

13639823 is a deficient number, since it is larger than the sum of its proper divisors (290257).

13639823 is an equidigital number, since it uses as much as digits as its factorization.

13639823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290256.

The product of its digits is 23328, while the sum is 35.

The square root of 13639823 is about 3693.2130997277. The cubic root of 13639823 is about 238.9293921428.

The spelling of 13639823 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred twenty-three".