864947 has 2 divisors, whose sum is σ = 864948. Its totient is φ = 864946.

The previous prime is 864917. The next prime is 864953. The reversal of 864947 is 749468.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864947 - 2⁶ = 864883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864947.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 864947.

It is not a weakly prime, because it can be changed into another prime (864917) 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 as a sum of consecutive naturals, namely, 432473 + 432474.

It is an arithmetic number, because the mean of its divisors is an integer number (432474).

2⁸⁶⁴⁹⁴⁷ is an apocalyptic number.

864947 is a deficient number, since it is larger than the sum of its proper divisors (1).

864947 is an equidigital number, since it uses as much as digits as its factorization.

864947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 864947 is about 930.0252684739. The cubic root of 864947 is about 95.2788483010.

The spelling of 864947 in words is "eight hundred sixty-four thousand, nine hundred forty-seven".