19465381988 has 48 divisors (see below), whose sum is σ = 39514653696. Its totient is φ = 8316190080.

The previous prime is 19465381981. The next prime is 19465381997. The reversal of 19465381988 is 88918356491.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a self number, because there is not a number n which added to its sum of digits gives 19465381988.

It is not an unprimeable number, because it can be changed into a prime (19465381981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225431 + ... + 299582.

It is an arithmetic number, because the mean of its divisors is an integer number (823221952).

Almost surely, 2^19465381988 is an apocalyptic number.

It is an amenable number.

19465381988 is an abundant number, since it is smaller than the sum of its proper divisors (20049271708).

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

19465381988 is a wasteful number, since it uses less digits than its factorization.

19465381988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525084 (or 525082 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 62.

The spelling of 19465381988 in words is "nineteen billion, four hundred sixty-five million, three hundred eighty-one thousand, nine hundred eighty-eight".