18001863 has 12 divisors (see below), whose sum is σ = 28366728. Its totient is φ = 10910160.

The previous prime is 18001859. The next prime is 18001871. The reversal of 18001863 is 36810081.

It is not a de Polignac number, because 18001863 - 2² = 18001859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90820 + ... + 91017.

It is an arithmetic number, because the mean of its divisors is an integer number (2363894).

Almost surely, 2^18001863 is an apocalyptic number.

18001863 is a deficient number, since it is larger than the sum of its proper divisors (10364865).

18001863 is a wasteful number, since it uses less digits than its factorization.

18001863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181854 (or 181851 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18001863 is about 4242.8602380941. The cubic root of 18001863 is about 262.0831806668.

It can be divided in two parts, 180018 and 63, that added together give a palindrome (180081).

The spelling of 18001863 in words is "eighteen million, one thousand, eight hundred sixty-three".