816826 has 4 divisors (see below), whose sum is σ = 1225242. Its totient is φ = 408412.

The previous prime is 816821. The next prime is 816839. The reversal of 816826 is 628618.

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

It can be written as a sum of positive squares in only one way, i.e., 455625 + 361201 = 675^2 + 601^2 .

It is not an unprimeable number, because it can be changed into a prime (816821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204205 + ... + 204208.

2⁸¹⁶⁸²⁶ is an apocalyptic number.

816826 is a deficient number, since it is larger than the sum of its proper divisors (408416).

816826 is a wasteful number, since it uses less digits than its factorization.

816826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408415.

The product of its digits is 4608, while the sum is 31.

The square root of 816826 is about 903.7842662937. The cubic root of 816826 is about 93.4780945185.

Subtracting from 816826 its product of digits (4608), we obtain a palindrome (812218).

The spelling of 816826 in words is "eight hundred sixteen thousand, eight hundred twenty-six".