18398385684 has 120 divisors (see below), whose sum is σ = 55031419520. Its totient is φ = 5250619584.

The previous prime is 18398385683. The next prime is 18398385701. The reversal of 18398385684 is 48658389381.

18398385684 is a `hidden beast` number, since 1 + 8 + 39 + 8 + 38 + 568 + 4 = 666.

It is a super-2 number, since 2×18398385684² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398385683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2188962 + ... + 2197350.

Almost surely, 2^18398385684 is an apocalyptic number.

18398385684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18398385684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27515709760).

18398385684 is an abundant number, since it is smaller than the sum of its proper divisors (36633033836).

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

18398385684 is a wasteful number, since it uses less digits than its factorization.

18398385684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9379 (or 9368 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 63.

The spelling of 18398385684 in words is "eighteen billion, three hundred ninety-eight million, three hundred eighty-five thousand, six hundred eighty-four".