3218218 has 4 divisors (see below), whose sum is σ = 4827330. Its totient is φ = 1609108.

The previous prime is 3218209. The next prime is 3218221. The reversal of 3218218 is 8128123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8128123 = 37 ⋅219679.

It can be written as a sum of positive squares in only one way, i.e., 2732409 + 485809 = 1653^2 + 697^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3218192 and 3218201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804553 + ... + 804556.

Almost surely, 2^3218218 is an apocalyptic number.

3218218 is a deficient number, since it is larger than the sum of its proper divisors (1609112).

3218218 is a wasteful number, since it uses less digits than its factorization.

3218218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609111.

The product of its digits is 768, while the sum is 25.

The square root of 3218218 is about 1793.9392408886. The cubic root of 3218218 is about 147.6403796171.

The spelling of 3218218 in words is "three million, two hundred eighteen thousand, two hundred eighteen".