3218813 has 4 divisors (see below), whose sum is σ = 3466428. Its totient is φ = 2971200.

The previous prime is 3218807. The next prime is 3218819. The reversal of 3218813 is 3188123.

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

It is an interprime number because it is at equal distance from previous prime (3218807) and next prime (3218819).

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 1923769 = 1138^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 3218813 - 2⁶ = 3218749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123788 + ... + 123813.

It is an arithmetic number, because the mean of its divisors is an integer number (866607).

Almost surely, 2^3218813 is an apocalyptic number.

It is an amenable number.

3218813 is a deficient number, since it is larger than the sum of its proper divisors (247615).

3218813 is a wasteful number, since it uses less digits than its factorization.

3218813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247614.

The product of its digits is 1152, while the sum is 26.

The square root of 3218813 is about 1794.1050693870. The cubic root of 3218813 is about 147.6494778834.

The spelling of 3218813 in words is "three million, two hundred eighteen thousand, eight hundred thirteen".