18866841 has 8 divisors (see below), whose sum is σ = 28749504. Its totient is φ = 10781040.

The previous prime is 18866833. The next prime is 18866851. The reversal of 18866841 is 14866881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18866841 - 2³ = 18866833 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18866793 and 18866802.

It is not an unprimeable number, because it can be changed into a prime (18866801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449190 + ... + 449231.

It is an arithmetic number, because the mean of its divisors is an integer number (3593688).

Almost surely, 2^18866841 is an apocalyptic number.

It is an amenable number.

18866841 is a deficient number, since it is larger than the sum of its proper divisors (9882663).

18866841 is an equidigital number, since it uses as much as digits as its factorization.

18866841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898431.

The product of its digits is 73728, while the sum is 42.

The square root of 18866841 is about 4343.5977023661. The cubic root of 18866841 is about 266.2153315084.

The spelling of 18866841 in words is "eighteen million, eight hundred sixty-six thousand, eight hundred forty-one".