8168643 has 18 divisors (see below), whose sum is σ = 13726284. Its totient is φ = 4667544.

The previous prime is 8168623. The next prime is 8168669. The reversal of 8168643 is 3468618.

It is a happy number.

8168643 is a `hidden beast` number, since 8 + 1 + 6 + 8 + 643 = 666.

It is not a de Polignac number, because 8168643 - 2⁶ = 8168579 is a prime.

It is a super-2 number, since 2×8168643² = 133453456922898, which contains 22 as substring.

8168643 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8168598 and 8168607.

It is not an unprimeable number, because it can be changed into a prime (8168603) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8821 + ... + 9702.

Almost surely, 2^8168643 is an apocalyptic number.

8168643 is a deficient number, since it is larger than the sum of its proper divisors (5557641).

8168643 is a wasteful number, since it uses less digits than its factorization.

8168643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18543 (or 18533 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 8168643 is about 2858.0837986315. The cubic root of 8168643 is about 201.3955972237.

The spelling of 8168643 in words is "eight million, one hundred sixty-eight thousand, six hundred forty-three".