11999990 has 8 divisors (see below), whose sum is σ = 21600000. Its totient is φ = 4799992.

The previous prime is 11999989. The next prime is 12000017. The reversal of 11999990 is 9999911.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 599990 + ... + 600009.

It is an arithmetic number, because the mean of its divisors is an integer number (2700000).

Almost surely, 2^11999990 is an apocalyptic number.

11999990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11999990 is a deficient number, since it is larger than the sum of its proper divisors (9600010).

11999990 is a wasteful number, since it uses less digits than its factorization.

11999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200006.

The product of its (nonzero) digits is 59049, while the sum is 47.

The square root of 11999990 is about 3464.1001717618. The cubic root of 11999990 is about 228.9427849154.

It can be divided in two parts, 11 and 999990, that added together give a palindrome (1000001).

The spelling of 11999990 in words is "eleven million, nine hundred ninety-nine thousand, nine hundred ninety".