3218605 has 16 divisors (see below), whose sum is σ = 4198320. Its totient is φ = 2368704.

The previous prime is 3218587. The next prime is 3218609. The reversal of 3218605 is 5068123.

It is a happy number.

3218605 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 8 ways, for example, as 1572516 + 1646089 = 1254^2 + 1283^2 .

It is not a de Polignac number, because 3218605 - 2⁷ = 3218477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3218605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218609) 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 15 ways as a sum of consecutive naturals, for example, 10839 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (262395).

Almost surely, 2^3218605 is an apocalyptic number.

3218605 is the 1465-th pentagonal number.

It is an amenable number.

3218605 is a deficient number, since it is larger than the sum of its proper divisors (979715).

3218605 is an equidigital number, since it uses as much as digits as its factorization.

3218605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 3218605 is about 1794.0471008310. The cubic root of 3218605 is about 147.6462974405.

The spelling of 3218605 in words is "three million, two hundred eighteen thousand, six hundred five".