816923 has 4 divisors (see below), whose sum is σ = 839040. Its totient is φ = 794808.

The previous prime is 816919. The next prime is 816929. The reversal of 816923 is 329618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329618 = 2 ⋅164809.

It is a cyclic number.

It is not a de Polignac number, because 816923 - 2² = 816919 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816929) 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, 11003 + ... + 11076.

It is an arithmetic number, because the mean of its divisors is an integer number (209760).

2⁸¹⁶⁹²³ is an apocalyptic number.

816923 is a deficient number, since it is larger than the sum of its proper divisors (22117).

816923 is a wasteful number, since it uses less digits than its factorization.

816923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22116.

The product of its digits is 2592, while the sum is 29.

The square root of 816923 is about 903.8379279495. The cubic root of 816923 is about 93.4817946195.

It can be divided in two parts, 8169 and 23, that added together give a 13-th power (8192 = 2¹³).

The spelling of 816923 in words is "eight hundred sixteen thousand, nine hundred twenty-three".