13775999 has 2 divisors, whose sum is σ = 13776000. Its totient is φ = 13775998.

The previous prime is 13775989. The next prime is 13776017. The reversal of 13775999 is 99957731.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13775999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13775939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6887999 + 6888000.

It is an arithmetic number, because the mean of its divisors is an integer number (6888000).

Almost surely, 2^13775999 is an apocalyptic number.

13775999 is a deficient number, since it is larger than the sum of its proper divisors (1).

13775999 is an equidigital number, since it uses as much as digits as its factorization.

13775999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 535815, while the sum is 50.

The square root of 13775999 is about 3711.6032923792. The cubic root of 13775999 is about 239.7218942981.

The spelling of 13775999 in words is "thirteen million, seven hundred seventy-five thousand, nine hundred ninety-nine".