13990321 has 4 divisors (see below), whose sum is σ = 13999972. Its totient is φ = 13980672.

The previous prime is 13990313. The next prime is 13990367. The reversal of 13990321 is 12309931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 10962721 = 1740^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 13990321 - 2³ = 13990313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13990321.

It is not an unprimeable number, because it can be changed into a prime (13990121) 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, 2160 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (3499993).

Almost surely, 2^13990321 is an apocalyptic number.

13990321 is the 2160-th hex number.

It is an amenable number.

13990321 is a deficient number, since it is larger than the sum of its proper divisors (9651).

13990321 is an equidigital number, since it uses as much as digits as its factorization.

13990321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9650.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 13990321 is about 3740.3637523642. The cubic root of 13990321 is about 240.9586713104.

The spelling of 13990321 in words is "thirteen million, nine hundred ninety thousand, three hundred twenty-one".