18043181 has 8 divisors (see below), whose sum is σ = 19549824. Its totient is φ = 16553520.

The previous prime is 18043169. The next prime is 18043183. The reversal of 18043181 is 18134081.

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 18043181 - 2¹⁴ = 18026797 is a prime.

It is a super-2 number, since 2×18043181² = 651112761197522, which contains 22 as substring.

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 18043181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043183) 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 7 ways as a sum of consecutive naturals, for example, 1985 + ... + 6326.

It is an arithmetic number, because the mean of its divisors is an integer number (2443728).

Almost surely, 2^18043181 is an apocalyptic number.

It is an amenable number.

18043181 is a deficient number, since it is larger than the sum of its proper divisors (1506643).

18043181 is a wasteful number, since it uses less digits than its factorization.

18043181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8491.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 18043181 is about 4247.7265684128. The cubic root of 18043181 is about 262.2835391642.

The spelling of 18043181 in words is "eighteen million, forty-three thousand, one hundred eighty-one".