816623 has 4 divisors (see below), whose sum is σ = 827040. Its totient is φ = 806208.

The previous prime is 816593. The next prime is 816649. The reversal of 816623 is 326618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326618 = 2 ⋅163309.

It is a cyclic number.

It is not a de Polignac number, because 816623 - 2⁶ = 816559 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 816592 and 816601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816653) 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, 5090 + ... + 5247.

It is an arithmetic number, because the mean of its divisors is an integer number (206760).

2⁸¹⁶⁶²³ is an apocalyptic number.

816623 is a deficient number, since it is larger than the sum of its proper divisors (10417).

816623 is a wasteful number, since it uses less digits than its factorization.

816623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10416.

The product of its digits is 1728, while the sum is 26.

The square root of 816623 is about 903.6719537531. The cubic root of 816623 is about 93.4703500599.

The spelling of 816623 in words is "eight hundred sixteen thousand, six hundred twenty-three".