18089943 has 4 divisors (see below), whose sum is σ = 24119928. Its totient is φ = 12059960.

The previous prime is 18089927. The next prime is 18089947. The reversal of 18089943 is 34998081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34998081 = 3 ⋅11666027.

It is a cyclic number.

It is not a de Polignac number, because 18089943 - 2⁴ = 18089927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18089895 and 18089904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089947) 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, 3014988 + ... + 3014993.

It is an arithmetic number, because the mean of its divisors is an integer number (6029982).

Almost surely, 2^18089943 is an apocalyptic number.

18089943 is a deficient number, since it is larger than the sum of its proper divisors (6029985).

18089943 is an equidigital number, since it uses as much as digits as its factorization.

18089943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029984.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18089943 is about 4253.2273628387. The cubic root of 18089943 is about 262.5099279692.

The spelling of 18089943 in words is "eighteen million, eighty-nine thousand, nine hundred forty-three".