19438218488 has 64 divisors (see below), whose sum is σ = 39991311360. Its totient is φ = 8803149696.

The previous prime is 19438218463. The next prime is 19438218493. The reversal of 19438218488 is 88481283491.

It is a super-2 number, since 2×19438218488² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827281 + ... + 1837887.

It is an arithmetic number, because the mean of its divisors is an integer number (624864240).

Almost surely, 2^19438218488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19438218488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19995655680).

19438218488 is an abundant number, since it is smaller than the sum of its proper divisors (20553092872).

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

19438218488 is a wasteful number, since it uses less digits than its factorization.

19438218488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10956 (or 10952 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 56.

The spelling of 19438218488 in words is "nineteen billion, four hundred thirty-eight million, two hundred eighteen thousand, four hundred eighty-eight".