18168943 has 8 divisors (see below), whose sum is σ = 19603136. Its totient is φ = 16740000.

The previous prime is 18168929. The next prime is 18168967. The reversal of 18168943 is 34986181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18168943 - 2¹⁷ = 18037871 is a prime.

It is a super-2 number, since 2×18168943² = 660220979474498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18168896 and 18168905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8833 + ... + 10693.

It is an arithmetic number, because the mean of its divisors is an integer number (2450392).

Almost surely, 2^18168943 is an apocalyptic number.

18168943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18168943 is a deficient number, since it is larger than the sum of its proper divisors (1434193).

18168943 is a wasteful number, since it uses less digits than its factorization.

18168943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625.

The product of its digits is 41472, while the sum is 40.

The square root of 18168943 is about 4262.5043108483. The cubic root of 18168943 is about 262.8915058961.

The spelling of 18168943 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred forty-three".