13990637 has 2 divisors, whose sum is σ = 13990638. Its totient is φ = 13990636.

The previous prime is 13990597. The next prime is 13990657. The reversal of 13990637 is 73609931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9449476 + 4541161 = 3074^2 + 2131^2 .

It is an emirp because it is prime and its reverse (73609931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13990637 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13990637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13990657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995318 + 6995319.

It is an arithmetic number, because the mean of its divisors is an integer number (6995319).

Almost surely, 2^13990637 is an apocalyptic number.

It is an amenable number.

13990637 is a deficient number, since it is larger than the sum of its proper divisors (1).

13990637 is an equidigital number, since it uses as much as digits as its factorization.

13990637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 13990637 is about 3740.4059940065. The cubic root of 13990637 is about 240.9604854782.

The spelling of 13990637 in words is "thirteen million, nine hundred ninety thousand, six hundred thirty-seven".