13999399 has 2 divisors, whose sum is σ = 13999400. Its totient is φ = 13999398.

The previous prime is 13999397. The next prime is 13999421. The reversal of 13999399 is 99399931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13999399 - 2¹ = 13999397 is a prime.

It is a super-2 number, since 2×13999399² = 391966344722402, which contains 22 as substring.

Together with 13999397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13999393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999699 + 6999700.

It is an arithmetic number, because the mean of its divisors is an integer number (6999700).

Almost surely, 2^13999399 is an apocalyptic number.

13999399 is a deficient number, since it is larger than the sum of its proper divisors (1).

13999399 is an equidigital number, since it uses as much as digits as its factorization.

13999399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 531441, while the sum is 52.

The square root of 13999399 is about 3741.5770739088. The cubic root of 13999399 is about 241.0107775694.

The spelling of 13999399 in words is "thirteen million, nine hundred ninety-nine thousand, three hundred ninety-nine".