18021343 has 16 divisors (see below), whose sum is σ = 19815840. Its totient is φ = 16321536.

The previous prime is 18021337. The next prime is 18021347. The reversal of 18021343 is 34312081.

It is a cyclic number.

It is not a de Polignac number, because 18021343 - 2⁹ = 18020831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64921 + ... + 65197.

It is an arithmetic number, because the mean of its divisors is an integer number (1238490).

Almost surely, 2^18021343 is an apocalyptic number.

18021343 is a deficient number, since it is larger than the sum of its proper divisors (1794497).

18021343 is a wasteful number, since it uses less digits than its factorization.

18021343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18021343 is about 4245.1552386220. The cubic root of 18021343 is about 262.1776808849.

The spelling of 18021343 in words is "eighteen million, twenty-one thousand, three hundred forty-three".