817423818 has 32 divisors (see below), whose sum is σ = 1806281856. Its totient is φ = 245296128.

The previous prime is 817423813. The next prime is 817423829. The reversal of 817423818 is 818324718.

817423818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 817423818.

It is not an unprimeable number, because it can be changed into a prime (817423813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171871 + ... + 176562.

It is an arithmetic number, because the mean of its divisors is an integer number (56446308).

Almost surely, 2^817423818 is an apocalyptic number.

817423818 is an abundant number, since it is smaller than the sum of its proper divisors (988858038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

817423818 is a wasteful number, since it uses less digits than its factorization.

817423818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348478.

The product of its digits is 86016, while the sum is 42.

The square root of 817423818 is about 28590.6246521478. The cubic root of 817423818 is about 935.0089384982.

The spelling of 817423818 in words is "eight hundred seventeen million, four hundred twenty-three thousand, eight hundred eighteen".