11555980 has 12 divisors (see below), whose sum is σ = 24267600. Its totient is φ = 4622384.

The previous prime is 11555977. The next prime is 11555987. The reversal of 11555980 is 8955511.

It is not an unprimeable number, because it can be changed into a prime (11555987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288880 + ... + 288919.

It is an arithmetic number, because the mean of its divisors is an integer number (2022300).

Almost surely, 2^11555980 is an apocalyptic number.

11555980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11555980 is an abundant number, since it is smaller than the sum of its proper divisors (12711620).

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

11555980 is a wasteful number, since it uses less digits than its factorization.

11555980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577808 (or 577806 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 34.

The square root of 11555980 is about 3399.4087721249. The cubic root of 11555980 is about 226.0835308738.

The spelling of 11555980 in words is "eleven million, five hundred fifty-five thousand, nine hundred eighty".