818444817 has 40 divisors (see below), whose sum is σ = 1290653760. Its totient is φ = 515432160.

The previous prime is 818444807. The next prime is 818444849. The reversal of 818444817 is 718444818.

It is a happy number.

It is not a de Polignac number, because 818444817 - 2⁷ = 818444689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (818444807) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 832108 + ... + 833090.

It is an arithmetic number, because the mean of its divisors is an integer number (32266344).

Almost surely, 2^818444817 is an apocalyptic number.

It is an amenable number.

818444817 is a deficient number, since it is larger than the sum of its proper divisors (472208943).

818444817 is a wasteful number, since it uses less digits than its factorization.

818444817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555 (or 1546 counting only the distinct ones).

The product of its digits is 229376, while the sum is 45.

The square root of 818444817 is about 28608.4745661141. The cubic root of 818444817 is about 935.3980658932.

Subtracting from 818444817 its reverse (718444818), we obtain a palindrome (99999999).

The spelling of 818444817 in words is "eight hundred eighteen million, four hundred forty-four thousand, eight hundred seventeen".