21840162 has 8 divisors (see below), whose sum is σ = 43680336. Its totient is φ = 7280052.

The previous prime is 21840157. The next prime is 21840193. The reversal of 21840162 is 26104812.

It is a sphenic number, since it is the product of 3 distinct primes.

21840162 is an admirable number.

It is a super-3 number, since 3×21840162³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820008 + ... + 1820019.

It is an arithmetic number, because the mean of its divisors is an integer number (5460042).

Almost surely, 2^21840162 is an apocalyptic number.

21840162 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.

21840162 is a wasteful number, since it uses less digits than its factorization.

21840162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640032.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21840162 is about 4673.3459105870. The cubic root of 21840162 is about 279.5236884993.

Adding to 21840162 its reverse (26104812), we get a palindrome (47944974).

The spelling of 21840162 in words is "twenty-one million, eight hundred forty thousand, one hundred sixty-two".