2218391 has 8 divisors (see below), whose sum is σ = 2617344. Its totient is φ = 1839960.

The previous prime is 2218367. The next prime is 2218423. The reversal of 2218391 is 1938122.

2218391 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2218391 - 2¹⁴ = 2202007 is a prime.

It is a Duffinian number.

2218391 is strictly pandigital in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2218391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218331) 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, 4895 + ... + 5328.

It is an arithmetic number, because the mean of its divisors is an integer number (327168).

2^2218391 is an apocalyptic number.

2218391 is a deficient number, since it is larger than the sum of its proper divisors (398953).

2218391 is a wasteful number, since it uses less digits than its factorization.

2218391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261.

The product of its digits is 864, while the sum is 26.

The square root of 2218391 is about 1489.4263996586. The cubic root of 2218391 is about 130.4205512605.

The spelling of 2218391 in words is "two million, two hundred eighteen thousand, three hundred ninety-one".