3213685 has 4 divisors (see below), whose sum is σ = 3856428. Its totient is φ = 2570944.

The previous prime is 3213659. The next prime is 3213689. The reversal of 3213685 is 5863123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 848241 + 2365444 = 921^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 3213685 - 2¹⁵ = 3180917 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 321364 + ... + 321373.

It is an arithmetic number, because the mean of its divisors is an integer number (964107).

Almost surely, 2^3213685 is an apocalyptic number.

It is an amenable number.

3213685 is a deficient number, since it is larger than the sum of its proper divisors (642743).

3213685 is an equidigital number, since it uses as much as digits as its factorization.

3213685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642742.

The product of its digits is 4320, while the sum is 28.

The square root of 3213685 is about 1792.6753749634. The cubic root of 3213685 is about 147.5710277469.

The spelling of 3213685 in words is "three million, two hundred thirteen thousand, six hundred eighty-five".