13989331 has 4 divisors (see below), whose sum is σ = 14040112. Its totient is φ = 13938552.

The previous prime is 13989289. The next prime is 13989337. The reversal of 13989331 is 13398931.

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 13989331 - 2¹⁵ = 13956563 is a prime.

It is a super-2 number, since 2×13989331² = 391402763655122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13989337) 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, 24975 + ... + 25528.

It is an arithmetic number, because the mean of its divisors is an integer number (3510028).

Almost surely, 2^13989331 is an apocalyptic number.

13989331 is a deficient number, since it is larger than the sum of its proper divisors (50781).

13989331 is an equidigital number, since it uses as much as digits as its factorization.

13989331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50780.

The product of its digits is 17496, while the sum is 37.

The square root of 13989331 is about 3740.2314099531. The cubic root of 13989331 is about 240.9529875068.

The spelling of 13989331 in words is "thirteen million, nine hundred eighty-nine thousand, three hundred thirty-one".