13871999 has 2 divisors, whose sum is σ = 13872000. Its totient is φ = 13871998.

The previous prime is 13871989. The next prime is 13872007. The reversal of 13871999 is 99917831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13871999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13871939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6935999 + 6936000.

It is an arithmetic number, because the mean of its divisors is an integer number (6936000).

Almost surely, 2^13871999 is an apocalyptic number.

13871999 is a deficient number, since it is larger than the sum of its proper divisors (1).

13871999 is an equidigital number, since it uses as much as digits as its factorization.

13871999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 13871999 is about 3724.5132567894. The cubic root of 13871999 is about 240.2774511208.

The spelling of 13871999 in words is "thirteen million, eight hundred seventy-one thousand, nine hundred ninety-nine".