18218841 has 8 divisors (see below), whose sum is σ = 24654624. Its totient is φ = 11964480.

The previous prime is 18218839. The next prime is 18218857. The reversal of 18218841 is 14881281.

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

It is not a de Polignac number, because 18218841 - 2¹ = 18218839 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18218821) 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, 45120 + ... + 45521.

It is an arithmetic number, because the mean of its divisors is an integer number (3081828).

Almost surely, 2^18218841 is an apocalyptic number.

It is an amenable number.

18218841 is a deficient number, since it is larger than the sum of its proper divisors (6435783).

18218841 is an equidigital number, since it uses as much as digits as its factorization.

18218841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90711.

The product of its digits is 4096, while the sum is 33.

The square root of 18218841 is about 4268.3534296026. The cubic root of 18218841 is about 263.1319486131.

The spelling of 18218841 in words is "eighteen million, two hundred eighteen thousand, eight hundred forty-one".