816322418 has 18 divisors (see below), whose sum is σ = 1243875981. Its totient is φ = 401797264.

The previous prime is 816322399. The next prime is 816322433. The reversal of 816322418 is 814223618.

It can be written as a sum of positive squares in 2 ways, for example, as 729702169 + 86620249 = 27013^2 + 9307^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20203.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3596021 + ... + 3596247.

Almost surely, 2^816322418 is an apocalyptic number.

816322418 is a deficient number, since it is larger than the sum of its proper divisors (427553563).

816322418 is an frugal number, since it uses more digits than its factorization.

816322418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 318 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 816322418 is about 28571.3566006236. The cubic root of 816322418 is about 934.5888048638.

Multiplying 816322418 by its product of digits (18432), we get a square (15046454808576 = 3878976²).

The spelling of 816322418 in words is "eight hundred sixteen million, three hundred twenty-two thousand, four hundred eighteen".