2218623 has 8 divisors (see below), whose sum is σ = 3227136. Its totient is φ = 1344600.

The previous prime is 2218621. The next prime is 2218663. The reversal of 2218623 is 3268122.

2218623 = 307² + 308² + ... + 328².

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

It is not a de Polignac number, because 2218623 - 2¹ = 2218621 is a prime.

It is a super-2 number, since 2×2218623² = 9844576032258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) 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 = 2218593 and 2218602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218621) 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, 33583 + ... + 33648.

It is an arithmetic number, because the mean of its divisors is an integer number (403392).

2^2218623 is an apocalyptic number.

2218623 is a deficient number, since it is larger than the sum of its proper divisors (1008513).

2218623 is a wasteful number, since it uses less digits than its factorization.

2218623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67245.

The product of its digits is 1152, while the sum is 24.

The square root of 2218623 is about 1489.5042799536. The cubic root of 2218623 is about 130.4250975756.

The spelling of 2218623 in words is "two million, two hundred eighteen thousand, six hundred twenty-three".