13990399 has 2 divisors, whose sum is σ = 13990400. Its totient is φ = 13990398.

The previous prime is 13990373. The next prime is 13990409. The reversal of 13990399 is 99309931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13990399 - 2⁵ = 13990367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13990369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995199 + 6995200.

It is an arithmetic number, because the mean of its divisors is an integer number (6995200).

Almost surely, 2^13990399 is an apocalyptic number.

13990399 is a deficient number, since it is larger than the sum of its proper divisors (1).

13990399 is an equidigital number, since it uses as much as digits as its factorization.

13990399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59049, while the sum is 43.

The square root of 13990399 is about 3740.3741791430. The cubic root of 13990399 is about 240.9591191139.

The spelling of 13990399 in words is "thirteen million, nine hundred ninety thousand, three hundred ninety-nine".