11811980 has 12 divisors (see below), whose sum is σ = 24805200. Its totient is φ = 4724784.

The previous prime is 11811973. The next prime is 11811983. The reversal of 11811980 is 8911811.

It is not an unprimeable number, because it can be changed into a prime (11811983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 295280 + ... + 295319.

It is an arithmetic number, because the mean of its divisors is an integer number (2067100).

Almost surely, 2^11811980 is an apocalyptic number.

11811980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11811980 is an abundant number, since it is smaller than the sum of its proper divisors (12993220).

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

11811980 is a wasteful number, since it uses less digits than its factorization.

11811980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590608 (or 590606 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 11811980 is about 3436.8561215157. The cubic root of 11811980 is about 227.7408309871.

The spelling of 11811980 in words is "eleven million, eight hundred eleven thousand, nine hundred eighty".