13990421 has 4 divisors (see below), whose sum is σ = 14042700. Its totient is φ = 13938144.

The previous prime is 13990409. The next prime is 13990433. The reversal of 13990421 is 12409931.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (13990409) and next prime (13990433).

It can be written as a sum of positive squares in 2 ways, for example, as 8491396 + 5499025 = 2914^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 13990421 - 2²² = 9796117 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 (13990451) 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, 25736 + ... + 26273.

It is an arithmetic number, because the mean of its divisors is an integer number (3510675).

Almost surely, 2^13990421 is an apocalyptic number.

It is an amenable number.

13990421 is a deficient number, since it is larger than the sum of its proper divisors (52279).

13990421 is an equidigital number, since it uses as much as digits as its factorization.

13990421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52278.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 13990421 is about 3740.3771200241. The cubic root of 13990421 is about 240.9592454171.

The spelling of 13990421 in words is "thirteen million, nine hundred ninety thousand, four hundred twenty-one".