19838967947 has 16 divisors (see below), whose sum is σ = 21471004800. Its totient is φ = 18290012160.

The previous prime is 19838967931. The next prime is 19838967961. The reversal of 19838967947 is 74976983891.

It is a cyclic number.

It is not a de Polignac number, because 19838967947 - 2⁴ = 19838967931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19838967997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121622 + ... + 233387.

It is an arithmetic number, because the mean of its divisors is an integer number (1341937800).

Almost surely, 2^19838967947 is an apocalyptic number.

19838967947 is a deficient number, since it is larger than the sum of its proper divisors (1632036853).

19838967947 is a wasteful number, since it uses less digits than its factorization.

19838967947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355126.

The product of its digits is 164602368, while the sum is 71.

The spelling of 19838967947 in words is "nineteen billion, eight hundred thirty-eight million, nine hundred sixty-seven thousand, nine hundred forty-seven".