18043109 has 8 divisors (see below), whose sum is σ = 21517440. Its totient is φ = 14792976.

The previous prime is 18043099. The next prime is 18043163. The reversal of 18043109 is 90134081.

18043109 = T₂₂₆₇ + T₂₂₆₈ + ... + T₂₂₇₃.

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 18043109 - 2⁴ = 18043093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043169) 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, 55874 + ... + 56195.

It is an arithmetic number, because the mean of its divisors is an integer number (2689680).

Almost surely, 2^18043109 is an apocalyptic number.

It is an amenable number.

18043109 is a deficient number, since it is larger than the sum of its proper divisors (3474331).

18043109 is a wasteful number, since it uses less digits than its factorization.

18043109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112099.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18043109 is about 4247.7180932826. The cubic root of 18043109 is about 262.2831902893.

It can be divided in two parts, 1804 and 3109, that added together give a cube (4913 = 17³).

The spelling of 18043109 in words is "eighteen million, forty-three thousand, one hundred nine".