13990961 has 4 divisors (see below), whose sum is σ = 14182692. Its totient is φ = 13799232.

The previous prime is 13990943. The next prime is 13990987. The reversal of 13990961 is 16909931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16909931 = 59 ⋅286609.

It can be written as a sum of positive squares in 2 ways, for example, as 9394225 + 4596736 = 3065^2 + 2144^2 .

It is a cyclic number.

It is not a de Polignac number, because 13990961 - 2¹⁴ = 13974577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13990261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95756 + ... + 95901.

It is an arithmetic number, because the mean of its divisors is an integer number (3545673).

Almost surely, 2^13990961 is an apocalyptic number.

It is an amenable number.

13990961 is a deficient number, since it is larger than the sum of its proper divisors (191731).

13990961 is an equidigital number, since it uses as much as digits as its factorization.

13990961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191730.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 13990961 is about 3740.4493045622. The cubic root of 13990961 is about 240.9623455458.

The spelling of 13990961 in words is "thirteen million, nine hundred ninety thousand, nine hundred sixty-one".