816506 has 8 divisors (see below), whose sum is σ = 1289280. Its totient is φ = 386748.

The previous prime is 816499. The next prime is 816521. The reversal of 816506 is 605618.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10706 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (161160).

2⁸¹⁶⁵⁰⁶ is an apocalyptic number.

816506 is a deficient number, since it is larger than the sum of its proper divisors (472774).

816506 is a wasteful number, since it uses less digits than its factorization.

816506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21508.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 816506 is about 903.6072155533. The cubic root of 816506 is about 93.4658859219.

The spelling of 816506 in words is "eight hundred sixteen thousand, five hundred six".