18420283 has 4 divisors (see below), whose sum is σ = 21051760. Its totient is φ = 15788808.

The previous prime is 18420271. The next prime is 18420289. The reversal of 18420283 is 38202481.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18420283 - 2⁵ = 18420251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18420289) 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, 1315728 + ... + 1315741.

It is an arithmetic number, because the mean of its divisors is an integer number (5262940).

Almost surely, 2^18420283 is an apocalyptic number.

18420283 is a deficient number, since it is larger than the sum of its proper divisors (2631477).

18420283 is an equidigital number, since it uses as much as digits as its factorization.

18420283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631476.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18420283 is about 4291.8857160926. The cubic root of 18420283 is about 264.0981948386.

The spelling of 18420283 in words is "eighteen million, four hundred twenty thousand, two hundred eighty-three".