13997993 has 2 divisors, whose sum is σ = 13997994. Its totient is φ = 13997992.

The previous prime is 13997983. The next prime is 13997999. The reversal of 13997993 is 39979931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11202409 + 2795584 = 3347^2 + 1672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13997993 is a prime.

It is not a weakly prime, because it can be changed into another prime (13997999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998996 + 6998997.

It is an arithmetic number, because the mean of its divisors is an integer number (6998997).

Almost surely, 2^13997993 is an apocalyptic number.

It is an amenable number.

13997993 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997993 is an equidigital number, since it uses as much as digits as its factorization.

13997993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 413343, while the sum is 50.

The square root of 13997993 is about 3741.3891805050. The cubic root of 13997993 is about 241.0027088302.

The spelling of 13997993 in words is "thirteen million, nine hundred ninety-seven thousand, nine hundred ninety-three".