11999880 has 128 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 3110400.

The previous prime is 11999879. The next prime is 11999903. The reversal of 11999880 is 8899911.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44145 + ... + 44415.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 2^11999880 is an apocalyptic number.

11999880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11999880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20563200).

11999880 is an abundant number, since it is smaller than the sum of its proper divisors (29126520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11999880 is a wasteful number, since it uses less digits than its factorization.

11999880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 11999880 is about 3464.0842945864. The cubic root of 11999880 is about 228.9420853653.

It can be divided in two parts, 119 and 99880, that added together give a palindrome (99999).

The spelling of 11999880 in words is "eleven million, nine hundred ninety-nine thousand, eight hundred eighty".