393822800018 has 18 divisors (see below), whose sum is σ = 592640002773. Its totient is φ = 196278173040.

The previous prime is 393822800011. The next prime is 393822800023. The reversal of 393822800018 is 810008228393.

It can be written as a sum of positive squares in 2 ways, for example, as 331549094809 + 62273705209 = 575803^2 + 249547^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=443747.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393822800011) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 405584273 + ... + 405585243.

Almost surely, 2^393822800018 is an apocalyptic number.

393822800018 is a deficient number, since it is larger than the sum of its proper divisors (198817202755).

393822800018 is an frugal number, since it uses more digits than its factorization.

393822800018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858 (or 1430 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 393822800018 in words is "three hundred ninety-three billion, eight hundred twenty-two million, eight hundred thousand, eighteen".