17989783854 has 48 divisors (see below), whose sum is σ = 41922039888. Its totient is φ = 5131555968.

The previous prime is 17989783853. The next prime is 17989783883. The reversal of 17989783854 is 45838798971.

It is a super-2 number, since 2×17989783854² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17989783853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131812 + ... + 230984.

It is an arithmetic number, because the mean of its divisors is an integer number (873375831).

Almost surely, 2^17989783854 is an apocalyptic number.

17989783854 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 17989783854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20961019944).

17989783854 is an abundant number, since it is smaller than the sum of its proper divisors (23932256034).

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

17989783854 is a wasteful number, since it uses less digits than its factorization.

17989783854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99809 (or 99802 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 69.

The spelling of 17989783854 in words is "seventeen billion, nine hundred eighty-nine million, seven hundred eighty-three thousand, eight hundred fifty-four".