21840182 has 64 divisors (see below), whose sum is σ = 43008000. Its totient is φ = 8255520.

The previous prime is 21840157. The next prime is 21840193. The reversal of 21840182 is 28104812.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 31 ways as a sum of consecutive naturals, for example, 276419 + ... + 276497.

It is an arithmetic number, because the mean of its divisors is an integer number (672000).

Almost surely, 2^21840182 is an apocalyptic number.

21840182 is a deficient number, since it is larger than the sum of its proper divisors (21167818).

21840182 is a wasteful number, since it uses less digits than its factorization.

21840182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21840182 is about 4673.3480503810. The cubic root of 21840182 is about 279.5237738234.

Adding to 21840182 its reverse (28104812), we get a palindrome (49944994).

It can be divided in two parts, 21840 and 182, that added together give a palindrome (22022).

The spelling of 21840182 in words is "twenty-one million, eight hundred forty thousand, one hundred eighty-two".