19877889385 has 8 divisors (see below), whose sum is σ = 23855098176. Its totient is φ = 15901224240.

The previous prime is 19877889377. The next prime is 19877889389. The reversal of 19877889385 is 58398877891.

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

It is not a de Polignac number, because 19877889385 - 2³ = 19877889377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19877889389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50599 + ... + 205708.

It is an arithmetic number, because the mean of its divisors is an integer number (2981887272).

Almost surely, 2^19877889385 is an apocalyptic number.

It is an amenable number.

19877889385 is a deficient number, since it is larger than the sum of its proper divisors (3977208791).

19877889385 is a wasteful number, since it uses less digits than its factorization.

19877889385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271823.

The product of its digits is 243855360, while the sum is 73.

The spelling of 19877889385 in words is "nineteen billion, eight hundred seventy-seven million, eight hundred eighty-nine thousand, three hundred eighty-five".