8643813 has 4 divisors (see below), whose sum is σ = 11525088. Its totient is φ = 5762540.

The previous prime is 8643797. The next prime is 8643821. The reversal of 8643813 is 3183468.

8643813 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8643813 - 2⁴ = 8643797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643893) 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, 1440633 + ... + 1440638.

It is an arithmetic number, because the mean of its divisors is an integer number (2881272).

Almost surely, 2^8643813 is an apocalyptic number.

It is an amenable number.

8643813 is a deficient number, since it is larger than the sum of its proper divisors (2881275).

8643813 is a wasteful number, since it uses less digits than its factorization.

8643813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881274.

The product of its digits is 13824, while the sum is 33.

The square root of 8643813 is about 2940.0362242666. The cubic root of 8643813 is about 205.2272949872.

The spelling of 8643813 in words is "eight million, six hundred forty-three thousand, eight hundred thirteen".