11989880 has 32 divisors (see below), whose sum is σ = 30831840. Its totient is φ = 4110720.

The previous prime is 11989837. The next prime is 11989883. The reversal of 11989880 is 8898911.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21131 + ... + 21690.

It is an arithmetic number, because the mean of its divisors is an integer number (963495).

Almost surely, 2^11989880 is an apocalyptic number.

11989880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11989880 is an abundant number, since it is smaller than the sum of its proper divisors (18841960).

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

11989880 is a wasteful number, since it uses less digits than its factorization.

11989880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42839 (or 42835 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 11989880 is about 3462.6406108633. The cubic root of 11989880 is about 228.8784720318.

The spelling of 11989880 in words is "eleven million, nine hundred eighty-nine thousand, eight hundred eighty".