18027799 has 4 divisors (see below), whose sum is σ = 18068400. Its totient is φ = 17987200.

The previous prime is 18027767. The next prime is 18027829. The reversal of 18027799 is 99772081.

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 18027799 - 2⁵ = 18027767 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 (18027199) 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 3 ways as a sum of consecutive naturals, for example, 19627 + ... + 20524.

It is an arithmetic number, because the mean of its divisors is an integer number (4517100).

Almost surely, 2^18027799 is an apocalyptic number.

18027799 is a deficient number, since it is larger than the sum of its proper divisors (40601).

18027799 is an equidigital number, since it uses as much as digits as its factorization.

18027799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40600.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 18027799 is about 4245.9155667535. The cubic root of 18027799 is about 262.2089848231.

The spelling of 18027799 in words is "eighteen million, twenty-seven thousand, seven hundred ninety-nine".