18043851 has 16 divisors (see below), whose sum is σ = 29113344. Its totient is φ = 9704064.

The previous prime is 18043847. The next prime is 18043867. The reversal of 18043851 is 15834081.

It is not a de Polignac number, because 18043851 - 2² = 18043847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18043801) 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 15 ways as a sum of consecutive naturals, for example, 24915 + ... + 25628.

It is an arithmetic number, because the mean of its divisors is an integer number (1819584).

Almost surely, 2^18043851 is an apocalyptic number.

18043851 is a deficient number, since it is larger than the sum of its proper divisors (11069493).

18043851 is a wasteful number, since it uses less digits than its factorization.

18043851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50570.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18043851 is about 4247.8054333973. The cubic root of 18043851 is about 262.2867855946.

The spelling of 18043851 in words is "eighteen million, forty-three thousand, eight hundred fifty-one".