19989439488 has 132 divisors (see below), whose sum is σ = 58110440700. Its totient is φ = 6617972736.

The previous prime is 19989439453. The next prime is 19989439523. The reversal of 19989439488 is 88493498991.

19989439488 is a `hidden beast` number, since 19 + 98 + 9 + 43 + 9 + 488 = 666.

It is an interprime number because it is at equal distance from previous prime (19989439453) and next prime (19989439523).

It can be written as a sum of positive squares in 2 ways, for example, as 2767601664 + 17221837824 = 52608^2 + 131232^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1365906 + ... + 1380462.

Almost surely, 2^19989439488 is an apocalyptic number.

19989439488 is a gapful number since it is divisible by the number (18) 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 19989439488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29055220350).

19989439488 is an abundant number, since it is smaller than the sum of its proper divisors (38121001212).

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

19989439488 is a wasteful number, since it uses less digits than its factorization.

19989439488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14732 (or 14711 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 72.

The spelling of 19989439488 in words is "nineteen billion, nine hundred eighty-nine million, four hundred thirty-nine thousand, four hundred eighty-eight".