21838384 has 20 divisors (see below), whose sum is σ = 43677760. Its totient is φ = 10566720.

The previous prime is 21838381. The next prime is 21838433. The reversal of 21838384 is 48383812.

21838384 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21838381) by changing a digit.

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, 21519 + ... + 22510.

It is an arithmetic number, because the mean of its divisors is an integer number (2183888).

Almost surely, 2^21838384 is an apocalyptic number.

It is an amenable number.

21838384 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.

21838384 is a wasteful number, since it uses less digits than its factorization.

21838384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44068 (or 44062 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 21838384 is about 4673.1556789818. The cubic root of 21838384 is about 279.5161029847.

It can be divided in two parts, 21838 and 384, that added together give a palindrome (22222).

The spelling of 21838384 in words is "twenty-one million, eight hundred thirty-eight thousand, three hundred eighty-four".