8643213 has 8 divisors (see below), whose sum is σ = 12804800. Its totient is φ = 5762124.

The previous prime is 8643211. The next prime is 8643223. The reversal of 8643213 is 3123468.

It is a happy number.

8643213 is a `hidden beast` number, since 8 + 643 + 2 + 13 = 666.

It is not a de Polignac number, because 8643213 - 2¹ = 8643211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 320119 = 8643213 / (8 + 6 + 4 + 3 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643211) 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 7 ways as a sum of consecutive naturals, for example, 160033 + ... + 160086.

It is an arithmetic number, because the mean of its divisors is an integer number (1600600).

Almost surely, 2^8643213 is an apocalyptic number.

It is an amenable number.

8643213 is a deficient number, since it is larger than the sum of its proper divisors (4161587).

8643213 is a wasteful number, since it uses less digits than its factorization.

8643213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320128 (or 320122 counting only the distinct ones).

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

The square root of 8643213 is about 2939.9341829368. The cubic root of 8643213 is about 205.2225463411. Note that the first 3 decimals are identical.

The spelling of 8643213 in words is "eight million, six hundred forty-three thousand, two hundred thirteen".