18481143 has 4 divisors (see below), whose sum is σ = 24641528. Its totient is φ = 12320760.

The previous prime is 18481097. The next prime is 18481157. The reversal of 18481143 is 34118481.

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

It is a de Polignac number, because none of the positive numbers 2^k-18481143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18481143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080188 + ... + 3080193.

It is an arithmetic number, because the mean of its divisors is an integer number (6160382).

Almost surely, 2^18481143 is an apocalyptic number.

18481143 is a deficient number, since it is larger than the sum of its proper divisors (6160385).

18481143 is an equidigital number, since it uses as much as digits as its factorization.

18481143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6160384.

The product of its digits is 3072, while the sum is 30.

The square root of 18481143 is about 4298.9699929169. The cubic root of 18481143 is about 264.3887323037.

The spelling of 18481143 in words is "eighteen million, four hundred eighty-one thousand, one hundred forty-three".