11983999 has 4 divisors (see below), whose sum is σ = 12180520. Its totient is φ = 11787480.

The previous prime is 11983987. The next prime is 11984009. The reversal of 11983999 is 99938911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11983999 - 2¹⁹ = 11459711 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 (11983969) 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 in 3 ways as a sum of consecutive naturals, for example, 98169 + ... + 98290.

It is an arithmetic number, because the mean of its divisors is an integer number (3045130).

Almost surely, 2^11983999 is an apocalyptic number.

11983999 is a deficient number, since it is larger than the sum of its proper divisors (196521).

11983999 is an equidigital number, since it uses as much as digits as its factorization.

11983999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196520.

The product of its digits is 157464, while the sum is 49.

The square root of 11983999 is about 3461.7912993131. The cubic root of 11983999 is about 228.8410445116.

The spelling of 11983999 in words is "eleven million, nine hundred eighty-three thousand, nine hundred ninety-nine".