816667 has 2 divisors, whose sum is σ = 816668. Its totient is φ = 816666.

The previous prime is 816653. The next prime is 816689. The reversal of 816667 is 766618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816667 - 2⁷ = 816539 is a prime.

It is not a weakly prime, because it can be changed into another prime (816367) 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, 408333 + 408334.

It is an arithmetic number, because the mean of its divisors is an integer number (408334).

2⁸¹⁶⁶⁶⁷ is an apocalyptic number.

816667 is a deficient number, since it is larger than the sum of its proper divisors (1).

816667 is an equidigital number, since it uses as much as digits as its factorization.

816667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 816667 is about 903.6962985428. The cubic root of 816667 is about 93.4720287707.

The spelling of 816667 in words is "eight hundred sixteen thousand, six hundred sixty-seven".