8640842 has 16 divisors (see below), whose sum is σ = 15023232. Its totient is φ = 3650640.

The previous prime is 8640823. The next prime is 8640859. The reversal of 8640842 is 2480468.

It is a junction number, because it is equal to n+sod(n) for n = 8640799 and 8640808.

It is an unprimeable number.

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, 3353 + ... + 5340.

It is an arithmetic number, because the mean of its divisors is an integer number (938952).

Almost surely, 2^8640842 is an apocalyptic number.

8640842 is a deficient number, since it is larger than the sum of its proper divisors (6382390).

8640842 is a wasteful number, since it uses less digits than its factorization.

8640842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8773.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 8640842 is about 2939.5309149591. The cubic root of 8640842 is about 205.2037791243.

The spelling of 8640842 in words is "eight million, six hundred forty thousand, eight hundred forty-two".