11990 has 16 divisors (see below), whose sum is σ = 23760. Its totient is φ = 4320.

The previous prime is 11987. The next prime is 12007. The reversal of 11990 is 9911.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56 + ... + 164.

It is an arithmetic number, because the mean of its divisors is an integer number (1485).

2¹¹⁹⁹⁰ is an apocalyptic number.

11990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 109×110.

11990 is a deficient number, since it is larger than the sum of its proper divisors (11770).

11990 is a wasteful number, since it uses less digits than its factorization.

11990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 11990 is about 109.4988584415. The cubic root of 11990 is about 22.8879235601.

It can be divided in two parts, 11 and 990, that added together give a palindrome (1001).

The spelling of 11990 in words is "eleven thousand, nine hundred ninety".