3213865 has 8 divisors (see below), whose sum is σ = 3892680. Its totient is φ = 2547072.

The previous prime is 3213853. The next prime is 3213877. The reversal of 3213865 is 5683123.

It is an interprime number because it is at equal distance from previous prime (3213853) and next prime (3213877).

It can be written as a sum of positive squares in 4 ways, for example, as 1245456 + 1968409 = 1116^2 + 1403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3213865 - 2⁷ = 3213737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2404 + ... + 3493.

It is an arithmetic number, because the mean of its divisors is an integer number (486585).

Almost surely, 2^3213865 is an apocalyptic number.

It is an amenable number.

3213865 is a deficient number, since it is larger than the sum of its proper divisors (678815).

3213865 is a wasteful number, since it uses less digits than its factorization.

3213865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011.

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

The square root of 3213865 is about 1792.7255785535. The cubic root of 3213865 is about 147.5737828696.

Adding to 3213865 its reverse (5683123), we get a palindrome (8896988).

It can be divided in two parts, 321 and 3865, that added together give a triangular number (4186 = T₉₁).

The spelling of 3213865 in words is "three million, two hundred thirteen thousand, eight hundred sixty-five".