11711980 has 144 divisors (see below), whose sum is σ = 32749920. Its totient is φ = 3483648.

The previous prime is 11711957. The next prime is 11711981. The reversal of 11711980 is 8911711.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (11711981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 316522 + ... + 316558.

It is an arithmetic number, because the mean of its divisors is an integer number (227430).

Almost surely, 2^11711980 is an apocalyptic number.

11711980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11711980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16374960).

11711980 is an abundant number, since it is smaller than the sum of its proper divisors (21037940).

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

11711980 is a wasteful number, since it uses less digits than its factorization.

11711980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 11711980 is about 3422.2770197633. The cubic root of 11711980 is about 227.0963255666.

The spelling of 11711980 in words is "eleven million, seven hundred eleven thousand, nine hundred eighty".