18282143 has 4 divisors (see below), whose sum is σ = 19944168. Its totient is φ = 16620120.

The previous prime is 18282139. The next prime is 18282149. The reversal of 18282143 is 34128281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34128281 = 11 ⋅3102571.

It is not a de Polignac number, because 18282143 - 2² = 18282139 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 (18282149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830996 + ... + 831017.

It is an arithmetic number, because the mean of its divisors is an integer number (4986042).

Almost surely, 2^18282143 is an apocalyptic number.

18282143 is a deficient number, since it is larger than the sum of its proper divisors (1662025).

18282143 is a wasteful number, since it uses less digits than its factorization.

18282143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662024.

The product of its digits is 3072, while the sum is 29.

The square root of 18282143 is about 4275.7622712214. The cubic root of 18282143 is about 263.4363500520.

The spelling of 18282143 in words is "eighteen million, two hundred eighty-two thousand, one hundred forty-three".