11989920 has 48 divisors (see below), whose sum is σ = 37769760. Its totient is φ = 3197184.

The previous prime is 11989919. The next prime is 11989927. The reversal of 11989920 is 2998911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (11989927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12010 + ... + 12969.

It is an arithmetic number, because the mean of its divisors is an integer number (786870).

Almost surely, 2^11989920 is an apocalyptic number.

11989920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11989920 is an abundant number, since it is smaller than the sum of its proper divisors (25779840).

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

11989920 is a wasteful number, since it uses less digits than its factorization.

11989920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24997 (or 24989 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 11989920 is about 3462.6463867972. The cubic root of 11989920 is about 228.8787265556.

The spelling of 11989920 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred twenty".