8640042 has 32 divisors (see below), whose sum is σ = 18202752. Its totient is φ = 2728704.

The previous prime is 8640017. The next prime is 8640059. The reversal of 8640042 is 2400468.

It is a junction number, because it is equal to n+sod(n) for n = 8639994 and 8640021.

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 15 ways as a sum of consecutive naturals, for example, 18678 + ... + 19134.

It is an arithmetic number, because the mean of its divisors is an integer number (568836).

Almost surely, 2^8640042 is an apocalyptic number.

8640042 is an abundant number, since it is smaller than the sum of its proper divisors (9562710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8640042 is a wasteful number, since it uses less digits than its factorization.

8640042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 8640042 is about 2939.3948356762. The cubic root of 8640042 is about 205.1974460960.

The spelling of 8640042 in words is "eight million, six hundred forty thousand, forty-two".