11718999 has 20 divisors (see below), whose sum is σ = 17641800. Its totient is φ = 7752240.

The previous prime is 11718979. The next prime is 11719009. The reversal of 11718999 is 99981711.

It is not a de Polignac number, because 11718999 - 2²³ = 3330391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11718979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11584 + ... + 12554.

It is an arithmetic number, because the mean of its divisors is an integer number (882090).

Almost surely, 2^11718999 is an apocalyptic number.

11718999 is a deficient number, since it is larger than the sum of its proper divisors (5922801).

11718999 is an equidigital number, since it uses as much as digits as its factorization.

11718999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1123 counting only the distinct ones).

The product of its digits is 40824, while the sum is 45.

The square root of 11718999 is about 3423.3023529919. The cubic root of 11718999 is about 227.1416828501.

The spelling of 11718999 in words is "eleven million, seven hundred eighteen thousand, nine hundred ninety-nine".