6640927 has 2 divisors, whose sum is σ = 6640928. Its totient is φ = 6640926.

The previous prime is 6640903. The next prime is 6640939. The reversal of 6640927 is 7290466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640927 is a prime.

It is a super-2 number, since 2×6640927² = 88203822838658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6640892 and 6640901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640967) 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 as a sum of consecutive naturals, namely, 3320463 + 3320464.

It is an arithmetic number, because the mean of its divisors is an integer number (3320464).

Almost surely, 2^6640927 is an apocalyptic number.

6640927 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640927 is an equidigital number, since it uses as much as digits as its factorization.

6640927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 6640927 is about 2576.9996119519. Note that the first 3 decimals coincide. The cubic root of 6640927 is about 187.9646738363.

The spelling of 6640927 in words is "six million, six hundred forty thousand, nine hundred twenty-seven".