19128820379 has 4 divisors (see below), whose sum is σ = 19129241040. Its totient is φ = 19128399720.

The previous prime is 19128820357. The next prime is 19128820397. The reversal of 19128820379 is 97302882191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19128820379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19128820309) 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, 132527 + ... + 236264.

It is an arithmetic number, because the mean of its divisors is an integer number (4782310260).

Almost surely, 2^19128820379 is an apocalyptic number.

19128820379 is a deficient number, since it is larger than the sum of its proper divisors (420661).

19128820379 is an equidigital number, since it uses as much as digits as its factorization.

19128820379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420660.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 19128820379 in words is "nineteen billion, one hundred twenty-eight million, eight hundred twenty thousand, three hundred seventy-nine".