19939287887 has 8 divisors (see below), whose sum is σ = 20336475600. Its totient is φ = 19542877120.

The previous prime is 19939287883. The next prime is 19939287889. The reversal of 19939287887 is 78878293991.

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

It is a cyclic number.

It is not a de Polignac number, because 19939287887 - 2² = 19939287883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19939287887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19939287883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142262 + ... + 245187.

It is an arithmetic number, because the mean of its divisors is an integer number (2542059450).

Almost surely, 2^19939287887 is an apocalyptic number.

19939287887 is a deficient number, since it is larger than the sum of its proper divisors (397187713).

19939287887 is an equidigital number, since it uses as much as digits as its factorization.

19939287887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388473.

The product of its digits is 109734912, while the sum is 71.

The spelling of 19939287887 in words is "nineteen billion, nine hundred thirty-nine million, two hundred eighty-seven thousand, eight hundred eighty-seven".