816947 has 2 divisors, whose sum is σ = 816948. Its totient is φ = 816946.

The previous prime is 816941. The next prime is 816961. The reversal of 816947 is 749618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816947 - 2⁶ = 816883 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 816947.

It is not a weakly prime, because it can be changed into another prime (816941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408473 + 408474.

It is an arithmetic number, because the mean of its divisors is an integer number (408474).

2⁸¹⁶⁹⁴⁷ is an apocalyptic number.

816947 is a deficient number, since it is larger than the sum of its proper divisors (1).

816947 is an equidigital number, since it uses as much as digits as its factorization.

816947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 816947 is about 903.8512045685. The cubic root of 816947 is about 93.4827100633.

The spelling of 816947 in words is "eight hundred sixteen thousand, nine hundred forty-seven".