6640042 has 8 divisors (see below), whose sum is σ = 9997632. Its totient is φ = 3307500.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640042 is 2400466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6639995 and 6640022.

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 3 ways as a sum of consecutive naturals, for example, 5584 + ... + 6667.

It is an arithmetic number, because the mean of its divisors is an integer number (1249704).

Almost surely, 2^6640042 is an apocalyptic number.

6640042 is a deficient number, since it is larger than the sum of its proper divisors (3357590).

6640042 is a wasteful number, since it uses less digits than its factorization.

6640042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12524.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 6640042 is about 2576.8278949127. The cubic root of 6640042 is about 187.9563237908.

The spelling of 6640042 in words is "six million, six hundred forty thousand, forty-two".