818947 has 2 divisors, whose sum is σ = 818948. Its totient is φ = 818946.

The previous prime is 818897. The next prime is 818959. The reversal of 818947 is 749818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818947 - 2⁷ = 818819 is a prime.

It is a Chen prime.

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

It is a plaindrome in base 13.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (818977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409473 + 409474.

It is an arithmetic number, because the mean of its divisors is an integer number (409474).

2⁸¹⁸⁹⁴⁷ is an apocalyptic number.

818947 is a deficient number, since it is larger than the sum of its proper divisors (1).

818947 is an equidigital number, since it uses as much as digits as its factorization.

818947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 818947 is about 904.9569050513. The cubic root of 818947 is about 93.5589341247.

The spelling of 818947 in words is "eight hundred eighteen thousand, nine hundred forty-seven".