18041863 has 4 divisors (see below), whose sum is σ = 20619280. Its totient is φ = 15464448.

The previous prime is 18041831. The next prime is 18041869. The reversal of 18041863 is 36814081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36814081 = 31 ⋅1187551.

It is a cyclic number.

It is not a de Polignac number, because 18041863 - 2⁵ = 18041831 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 (18041869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288698 + ... + 1288711.

It is an arithmetic number, because the mean of its divisors is an integer number (5154820).

Almost surely, 2^18041863 is an apocalyptic number.

18041863 is a deficient number, since it is larger than the sum of its proper divisors (2577417).

18041863 is an equidigital number, since it uses as much as digits as its factorization.

18041863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577416.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18041863 is about 4247.5714237668. The cubic root of 18041863 is about 262.2771526680.

The spelling of 18041863 in words is "eighteen million, forty-one thousand, eight hundred sixty-three".