818443 has 4 divisors (see below), whose sum is σ = 826200. Its totient is φ = 810688.

The previous prime is 818429. The next prime is 818453. The reversal of 818443 is 344818.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818443 is a prime.

It is a Duffinian number.

818443 is a lucky number.

It is a plaindrome in base 12 and base 15.

It is not an unprimeable number, because it can be changed into a prime (818413) 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, 3718 + ... + 3931.

It is an arithmetic number, because the mean of its divisors is an integer number (206550).

2⁸¹⁸⁴⁴³ is an apocalyptic number.

818443 is a deficient number, since it is larger than the sum of its proper divisors (7757).

818443 is a wasteful number, since it uses less digits than its factorization.

818443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

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

The square root of 818443 is about 904.6783958955. The cubic root of 818443 is about 93.5397373678.

The spelling of 818443 in words is "eight hundred eighteen thousand, four hundred forty-three".