13991223 has 4 divisors (see below), whose sum is σ = 18654968. Its totient is φ = 9327480.

The previous prime is 13991203. The next prime is 13991231. The reversal of 13991223 is 32219931.

It is a happy number.

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

It is not a de Polignac number, because 13991223 - 2⁵ = 13991191 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 (13991203) 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, 2331868 + ... + 2331873.

It is an arithmetic number, because the mean of its divisors is an integer number (4663742).

Almost surely, 2^13991223 is an apocalyptic number.

13991223 is a deficient number, since it is larger than the sum of its proper divisors (4663745).

13991223 is an equidigital number, since it uses as much as digits as its factorization.

13991223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663744.

The product of its digits is 2916, while the sum is 30.

The square root of 13991223 is about 3740.4843269288. The cubic root of 13991223 is about 240.9638496536.

The spelling of 13991223 in words is "thirteen million, nine hundred ninety-one thousand, two hundred twenty-three".