19842643887 has 8 divisors (see below), whose sum is σ = 28862027520. Its totient is φ = 12025844760.

The previous prime is 19842643811. The next prime is 19842643889. The reversal of 19842643887 is 78834624891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19842643887 - 2⁷ = 19842643759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19842643887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19842643889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300646087 + ... + 300646152.

It is an arithmetic number, because the mean of its divisors is an integer number (3607753440).

Almost surely, 2^19842643887 is an apocalyptic number.

19842643887 is a deficient number, since it is larger than the sum of its proper divisors (9019383633).

19842643887 is a wasteful number, since it uses less digits than its factorization.

19842643887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601292253.

The product of its digits is 18579456, while the sum is 60.

The spelling of 19842643887 in words is "nineteen billion, eight hundred forty-two million, six hundred forty-three thousand, eight hundred eighty-seven".