8643819 has 4 divisors (see below), whose sum is σ = 11525096. Its totient is φ = 5762544.

The previous prime is 8643797. The next prime is 8643821. The reversal of 8643819 is 9183468.

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

It is not a de Polignac number, because 8643819 - 2⁵ = 8643787 is a prime.

It is a super-2 number, since 2×8643819² = 149431213809522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8643839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440634 + ... + 1440639.

It is an arithmetic number, because the mean of its divisors is an integer number (2881274).

Almost surely, 2^8643819 is an apocalyptic number.

8643819 is a deficient number, since it is larger than the sum of its proper divisors (2881277).

8643819 is a wasteful number, since it uses less digits than its factorization.

8643819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881276.

The product of its digits is 41472, while the sum is 39.

The square root of 8643819 is about 2940.0372446620. The cubic root of 8643819 is about 205.2273424725.

The spelling of 8643819 in words is "eight million, six hundred forty-three thousand, eight hundred nineteen".