19391996547 has 24 divisors (see below), whose sum is σ = 34922384640. Its totient is φ = 10073764080.

The previous prime is 19391996539. The next prime is 19391996639. The reversal of 19391996547 is 74569919391.

It is not a de Polignac number, because 19391996547 - 2³ = 19391996539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19391996527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13990647 + ... + 13992032.

It is an arithmetic number, because the mean of its divisors is an integer number (1455099360).

Almost surely, 2^19391996547 is an apocalyptic number.

19391996547 is a deficient number, since it is larger than the sum of its proper divisors (15530388093).

19391996547 is a wasteful number, since it uses less digits than its factorization.

19391996547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27982703 (or 27982700 counting only the distinct ones).

The product of its digits is 16533720, while the sum is 63.

The spelling of 19391996547 in words is "nineteen billion, three hundred ninety-one million, nine hundred ninety-six thousand, five hundred forty-seven".