19389887980 has 96 divisors (see below), whose sum is σ = 43513344000. Its totient is φ = 7236552960.

The previous prime is 19389887953. The next prime is 19389887981. The reversal of 19389887980 is 8978898391.

It is not an unprimeable number, because it can be changed into a prime (19389887981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21283725 + ... + 21284635.

It is an arithmetic number, because the mean of its divisors is an integer number (453264000).

Almost surely, 2^19389887980 is an apocalyptic number.

19389887980 is a gapful number since it is divisible by the number (10) 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 19389887980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21756672000).

19389887980 is an abundant number, since it is smaller than the sum of its proper divisors (24123456020).

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

19389887980 is a wasteful number, since it uses less digits than its factorization.

19389887980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 70.

The spelling of 19389887980 in words is "nineteen billion, three hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred eighty".