393924690018 has 80 divisors (see below), whose sum is σ = 930269625120. Its totient is φ = 124246047744.

The previous prime is 393924690017. The next prime is 393924690059. The reversal of 393924690018 is 810096429393.

393924690018 is a `hidden beast` number, since 3 + 93 + 92 + 469 + 0 + 0 + 1 + 8 = 666.

It is a super-2 number, since 2×393924690018² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (393924690011) 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, 2468130 + ... + 2622882.

It is an arithmetic number, because the mean of its divisors is an integer number (11628370314).

Almost surely, 2^393924690018 is an apocalyptic number.

393924690018 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 393924690018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465134812560).

393924690018 is an abundant number, since it is smaller than the sum of its proper divisors (536344935102).

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

393924690018 is a wasteful number, since it uses less digits than its factorization.

393924690018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155613 (or 155604 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 393924690018 in words is "three hundred ninety-three billion, nine hundred twenty-four million, six hundred ninety thousand, eighteen".