3213684 has 18 divisors (see below), whose sum is σ = 8123570. Its totient is φ = 1071216.

The previous prime is 3213659. The next prime is 3213689. The reversal of 3213684 is 4863123.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 685584 = 1590^2 + 828^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44599 + ... + 44670.

Almost surely, 2^3213684 is an apocalyptic number.

It is an amenable number.

3213684 is an abundant number, since it is smaller than the sum of its proper divisors (4909886).

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

3213684 is a wasteful number, since it uses less digits than its factorization.

3213684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89279 (or 89274 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 3213684 is about 1792.6750960506. The cubic root of 3213684 is about 147.5710124404.

It can be divided in two parts, 321 and 3684, that added together give a triangular number (4005 = T₈₉).

The spelling of 3213684 in words is "three million, two hundred thirteen thousand, six hundred eighty-four".