11821684 has 12 divisors (see below), whose sum is σ = 23643424. Its totient is φ = 5066424.

The previous prime is 11821679. The next prime is 11821699. The reversal of 11821684 is 48612811.

11821684 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 211074 + ... + 211129.

Almost surely, 2^11821684 is an apocalyptic number.

11821684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

11821684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11821684 is a wasteful number, since it uses less digits than its factorization.

11821684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422214 (or 422212 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 11821684 is about 3438.2675870269. The cubic root of 11821684 is about 227.8031798933.

The spelling of 11821684 in words is "eleven million, eight hundred twenty-one thousand, six hundred eighty-four".