816845 has 8 divisors (see below), whose sum is σ = 1022976. Its totient is φ = 624976.

The previous prime is 816841. The next prime is 816847. The reversal of 816845 is 548618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816845 - 2² = 816841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3437 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (127872).

2⁸¹⁶⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

816845 is a deficient number, since it is larger than the sum of its proper divisors (206131).

816845 is a wasteful number, since it uses less digits than its factorization.

816845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131.

The product of its digits is 7680, while the sum is 32.

The square root of 816845 is about 903.7947775906. The cubic root of 816845 is about 93.4788193036.

It can be divided in two parts, 816 and 845, that added together give a palindrome (1661).

The spelling of 816845 in words is "eight hundred sixteen thousand, eight hundred forty-five".