18043799 has 4 divisors (see below), whose sum is σ = 18828336. Its totient is φ = 17259264.

The previous prime is 18043769. The next prime is 18043801. The reversal of 18043799 is 99734081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18043799 - 2²⁴ = 1266583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043769) 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 3 ways as a sum of consecutive naturals, for example, 392234 + ... + 392279.

It is an arithmetic number, because the mean of its divisors is an integer number (4707084).

Almost surely, 2^18043799 is an apocalyptic number.

18043799 is a deficient number, since it is larger than the sum of its proper divisors (784537).

18043799 is an equidigital number, since it uses as much as digits as its factorization.

18043799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784536.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18043799 is about 4247.7993125853. The cubic root of 18043799 is about 262.2865336357.

The spelling of 18043799 in words is "eighteen million, forty-three thousand, seven hundred ninety-nine".