11187999 has 6 divisors (see below), whose sum is σ = 16160456. Its totient is φ = 7458660.

The previous prime is 11187983. The next prime is 11188007. The reversal of 11187999 is 99978111.

It is not a de Polignac number, because 11187999 - 2⁴ = 11187983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11187899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 621547 + ... + 621564.

Almost surely, 2^11187999 is an apocalyptic number.

11187999 is a deficient number, since it is larger than the sum of its proper divisors (4972457).

11187999 is a wasteful number, since it uses less digits than its factorization.

11187999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243117 (or 1243114 counting only the distinct ones).

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

The square root of 11187999 is about 3344.8466332554. The cubic root of 11187999 is about 223.6578468447.

The spelling of 11187999 in words is "eleven million, one hundred eighty-seven thousand, nine hundred ninety-nine".