19873788947 has 4 divisors (see below), whose sum is σ = 20410918416. Its totient is φ = 19336659480.

The previous prime is 19873788877. The next prime is 19873788997. The reversal of 19873788947 is 74988737891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19873788947 - 2¹⁴ = 19873772563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19873788997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268564679 + ... + 268564752.

It is an arithmetic number, because the mean of its divisors is an integer number (5102729604).

Almost surely, 2^19873788947 is an apocalyptic number.

19873788947 is a deficient number, since it is larger than the sum of its proper divisors (537129469).

19873788947 is an equidigital number, since it uses as much as digits as its factorization.

19873788947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537129468.

The product of its digits is 170698752, while the sum is 71.

The spelling of 19873788947 in words is "nineteen billion, eight hundred seventy-three million, seven hundred eighty-eight thousand, nine hundred forty-seven".