13990309 has 4 divisors (see below), whose sum is σ = 14045004. Its totient is φ = 13935616.

The previous prime is 13990283. The next prime is 13990313. The reversal of 13990309 is 90309931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90309931 = 571 ⋅158161.

It can be written as a sum of positive squares in 2 ways, for example, as 8538084 + 5452225 = 2922^2 + 2335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13990309 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 (13990369) 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, 26962 + ... + 27475.

It is an arithmetic number, because the mean of its divisors is an integer number (3511251).

Almost surely, 2^13990309 is an apocalyptic number.

It is an amenable number.

13990309 is a deficient number, since it is larger than the sum of its proper divisors (54695).

13990309 is an equidigital number, since it uses as much as digits as its factorization.

13990309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54694.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 13990309 is about 3740.3621482418. The cubic root of 13990309 is about 240.9586024174.

The spelling of 13990309 in words is "thirteen million, nine hundred ninety thousand, three hundred nine".