2213645 has 8 divisors (see below), whose sum is σ = 3035904. Its totient is φ = 1517904.

The previous prime is 2213623. The next prime is 2213647. The reversal of 2213645 is 5463122.

2213645 = 858² + 859² + 860².

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 2213645 - 2⁸ = 2213389 is a prime.

It is a super-3 number, since 3×2213645³ = 32542070304819933375, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2213645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213647) 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, 31589 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (379488).

2^2213645 is an apocalyptic number.

It is an amenable number.

2213645 is a deficient number, since it is larger than the sum of its proper divisors (822259).

2213645 is an equidigital number, since it uses as much as digits as its factorization.

2213645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63259.

The product of its digits is 1440, while the sum is 23.

The square root of 2213645 is about 1487.8323158206. The cubic root of 2213645 is about 130.3274781170.

Adding to 2213645 its reverse (5463122), we get a palindrome (7676767).

The spelling of 2213645 in words is "two million, two hundred thirteen thousand, six hundred forty-five".