18443000 has 32 divisors (see below), whose sum is σ = 43158960. Its totient is φ = 7376800.

The previous prime is 18442969. The next prime is 18443003. The reversal of 18443000 is 34481.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8222 + ... + 10221.

Almost surely, 2^18443000 is an apocalyptic number.

18443000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18443000 is an abundant number, since it is smaller than the sum of its proper divisors (24715960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18443000 is a wasteful number, since it uses less digits than its factorization.

18443000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18464 (or 18450 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18443000 is about 4294.5314063353. The cubic root of 18443000 is about 264.2067174937.

Adding to 18443000 its reverse (34481), we get a palindrome (18477481).

The spelling of 18443000 in words is "eighteen million, four hundred forty-three thousand".