3218868 has 18 divisors (see below), whose sum is σ = 8136674. Its totient is φ = 1072944.

The previous prime is 3218861. The next prime is 3218893. The reversal of 3218868 is 8688123.

3218868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2683044 + 535824 = 1638^2 + 732^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×3218868² = 20722222402848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 89413 = 3218868 / (3 + 2 + 1 + 8 + 8 + 6 + 8).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44671 + ... + 44742.

Almost surely, 2^3218868 is an apocalyptic number.

It is an amenable number.

3218868 is an abundant number, since it is smaller than the sum of its proper divisors (4917806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3218868 is a wasteful number, since it uses less digits than its factorization.

3218868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89423 (or 89418 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 3218868 is about 1794.1203972978. The cubic root of 3218868 is about 147.6503188430.

The spelling of 3218868 in words is "three million, two hundred eighteen thousand, eight hundred sixty-eight".