816807 has 4 divisors (see below), whose sum is σ = 1089080. Its totient is φ = 544536.

The previous prime is 816779. The next prime is 816811. The reversal of 816807 is 708618.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 816807 - 2⁶ = 816743 is a prime.

It is a D-number.

It is a Duffinian number.

816807 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 816807.

It is not an unprimeable number, because it can be changed into a prime (816817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136132 + ... + 136137.

It is an arithmetic number, because the mean of its divisors is an integer number (272270).

2⁸¹⁶⁸⁰⁷ is an apocalyptic number.

816807 is a deficient number, since it is larger than the sum of its proper divisors (272273).

816807 is a wasteful number, since it uses less digits than its factorization.

816807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272272.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 816807 is about 903.7737548745. The cubic root of 816807 is about 93.4773697221.

The spelling of 816807 in words is "eight hundred sixteen thousand, eight hundred seven".