11721684 has 48 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 3480960.

The previous prime is 11721679. The next prime is 11721691. The reversal of 11721684 is 48612711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3229 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^11721684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11721684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15240960).

11721684 is an abundant number, since it is smaller than the sum of its proper divisors (18760236).

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

11721684 is a wasteful number, since it uses less digits than its factorization.

11721684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640 (or 2638 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 11721684 is about 3423.6944957166. The cubic root of 11721684 is about 227.1590287243.

The spelling of 11721684 in words is "eleven million, seven hundred twenty-one thousand, six hundred eighty-four".