19842384769 has 3 divisors (see below), whose sum is σ = 19842525633. Its totient is φ = 19842243906.

The previous prime is 19842384767. The next prime is 19842384797. The reversal of 19842384769 is 96748324891.

The square root of 19842384769 is 140863.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 19842384769 - 2¹ = 19842384767 is a prime.

It is a super-2 number, since 2×19842384769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19842384767) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70432 + ... + 211294.

It is an arithmetic number, because the mean of its divisors is an integer number (6614175211).

Almost surely, 2^19842384769 is an apocalyptic number.

19842384769 is the 140863-rd square number.

19842384769 is the 70432-nd centered octagonal number.

It is an amenable number.

19842384769 is a deficient number, since it is larger than the sum of its proper divisors (140864).

19842384769 is an frugal number, since it uses more digits than its factorization.

19842384769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281726 (or 140863 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

The spelling of 19842384769 in words is "nineteen billion, eight hundred forty-two million, three hundred eighty-four thousand, seven hundred sixty-nine".