6390947 has 2 divisors, whose sum is σ = 6390948. Its totient is φ = 6390946.

The previous prime is 6390907. The next prime is 6390949. The reversal of 6390947 is 7490936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6390947 - 2⁶ = 6390883 is a prime.

It is a super-3 number, since 3×6390947³ (a number of 21 digits) contains 333 as substring.

Together with 6390949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6390947.

It is not a weakly prime, because it can be changed into another prime (6390949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195473 + 3195474.

It is an arithmetic number, because the mean of its divisors is an integer number (3195474).

Almost surely, 2^6390947 is an apocalyptic number.

6390947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6390947 is an equidigital number, since it uses as much as digits as its factorization.

6390947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 6390947 is about 2528.0322387185. The cubic root of 6390947 is about 185.5759697355.

It can be divided in two parts, 6390 and 947, that added together give a palindrome (7337).

The spelling of 6390947 in words is "six million, three hundred ninety thousand, nine hundred forty-seven".