2218493 has 4 divisors (see below), whose sum is σ = 2226780. Its totient is φ = 2210208.

The previous prime is 2218451. The next prime is 2218519. The reversal of 2218493 is 3948122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 879844 + 1338649 = 938^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218493 - 2⁶ = 2218429 is a prime.

It is a super-2 number, since 2×2218493² = 9843422382098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218423) 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, 3728 + ... + 4281.

It is an arithmetic number, because the mean of its divisors is an integer number (556695).

2^2218493 is an apocalyptic number.

It is an amenable number.

2218493 is a deficient number, since it is larger than the sum of its proper divisors (8287).

2218493 is an equidigital number, since it uses as much as digits as its factorization.

2218493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8286.

The product of its digits is 3456, while the sum is 29.

The square root of 2218493 is about 1489.4606406347. The cubic root of 2218493 is about 130.4225501105.

It can be divided in two parts, 221 and 8493, that multiplied together give a triangular number (1876953 = T₁₉₃₇).

The spelling of 2218493 in words is "two million, two hundred eighteen thousand, four hundred ninety-three".