11691980 has 12 divisors (see below), whose sum is σ = 24553200. Its totient is φ = 4676784.

The previous prime is 11691949. The next prime is 11691983. The reversal of 11691980 is 8919611.

It is a self number, because there is not a number n which added to its sum of digits gives 11691980.

It is not an unprimeable number, because it can be changed into a prime (11691983) 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 3 ways as a sum of consecutive naturals, for example, 292280 + ... + 292319.

It is an arithmetic number, because the mean of its divisors is an integer number (2046100).

Almost surely, 2^11691980 is an apocalyptic number.

11691980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11691980 is an abundant number, since it is smaller than the sum of its proper divisors (12861220).

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

11691980 is a wasteful number, since it uses less digits than its factorization.

11691980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584608 (or 584606 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 11691980 is about 3419.3537401094. The cubic root of 11691980 is about 226.9669846607.

The spelling of 11691980 in words is "eleven million, six hundred ninety-one thousand, nine hundred eighty".