6640937 has 8 divisors (see below), whose sum is σ = 7030560. Its totient is φ = 6255360.

The previous prime is 6640927. The next prime is 6640939. The reversal of 6640937 is 7390466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640937 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6640897 and 6640906.

It is not an unprimeable number, because it can be changed into a prime (6640939) by changing a digit.

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, 2762 + ... + 4572.

It is an arithmetic number, because the mean of its divisors is an integer number (878820).

Almost surely, 2^6640937 is an apocalyptic number.

It is an amenable number.

6640937 is a deficient number, since it is larger than the sum of its proper divisors (389623).

6640937 is a wasteful number, since it uses less digits than its factorization.

6640937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6640937 is about 2577.0015521920. The cubic root of 6640937 is about 187.9647681828.

The spelling of 6640937 in words is "six million, six hundred forty thousand, nine hundred thirty-seven".