3218920 has 16 divisors (see below), whose sum is σ = 7242660. Its totient is φ = 1287552.

The previous prime is 3218911. The next prime is 3218939. The reversal of 3218920 is 298123.

3218920 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 2 ways, for example, as 3218436 + 484 = 1794^2 + 22^2 .

It is a super-2 number, since 2×3218920² = 20722891932800, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 40197 + ... + 40276.

Almost surely, 2^3218920 is an apocalyptic number.

It is an amenable number.

3218920 is an abundant number, since it is smaller than the sum of its proper divisors (4023740).

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

3218920 is a wasteful number, since it uses less digits than its factorization.

3218920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80484 (or 80480 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3218920 is about 1794.1348890203. The cubic root of 3218920 is about 147.6511139232.

The spelling of 3218920 in words is "three million, two hundred eighteen thousand, nine hundred twenty".