816818 has 8 divisors (see below), whose sum is σ = 1233900. Its totient is φ = 405520.

The previous prime is 816817. The next prime is 816821. The reversal of 816818 is 818618.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 734449 + 82369 = 857^2 + 287^2 .

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

It is not an unprimeable number, because it can be changed into a prime (816811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1668.

2⁸¹⁶⁸¹⁸ is an apocalyptic number.

816818 is a deficient number, since it is larger than the sum of its proper divisors (417082).

816818 is a wasteful number, since it uses less digits than its factorization.

816818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892.

The product of its digits is 3072, while the sum is 32.

The square root of 816818 is about 903.7798404479. The cubic root of 816818 is about 93.4777893424.

The spelling of 816818 in words is "eight hundred sixteen thousand, eight hundred eighteen".