19947015379 has 8 divisors (see below), whose sum is σ = 20593728512. Its totient is φ = 19300506120.

The previous prime is 19947015373. The next prime is 19947015437. The reversal of 19947015379 is 97351074991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19947015379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19947015373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162082 + ... + 257224.

It is an arithmetic number, because the mean of its divisors is an integer number (2574216064).

Almost surely, 2^19947015379 is an apocalyptic number.

19947015379 is a deficient number, since it is larger than the sum of its proper divisors (646713133).

19947015379 is an equidigital number, since it uses as much as digits as its factorization.

19947015379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101937.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The spelling of 19947015379 in words is "nineteen billion, nine hundred forty-seven million, fifteen thousand, three hundred seventy-nine".