18421824 has 28 divisors (see below), whose sum is σ = 48741584. Its totient is φ = 6140544.

The previous prime is 18421813. The next prime is 18421841. The reversal of 18421824 is 42812481.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18421791 and 18421800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47782 + ... + 48165.

Almost surely, 2^18421824 is an apocalyptic number.

It is an amenable number.

18421824 is an abundant number, since it is smaller than the sum of its proper divisors (30319760).

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

18421824 is an equidigital number, since it uses as much as digits as its factorization.

18421824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95962 (or 95952 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 18421824 is about 4292.0652371557. The cubic root of 18421824 is about 264.1055592562.

The spelling of 18421824 in words is "eighteen million, four hundred twenty-one thousand, eight hundred twenty-four".