19738513979 has 4 divisors (see below), whose sum is σ = 19741450584. Its totient is φ = 19735577376.

The previous prime is 19738513961. The next prime is 19738513981. The reversal of 19738513979 is 97931583791.

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 19738513979 - 2¹² = 19738509883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19738513079) 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, 1458197 + ... + 1471670.

It is an arithmetic number, because the mean of its divisors is an integer number (4935362646).

Almost surely, 2^19738513979 is an apocalyptic number.

19738513979 is a deficient number, since it is larger than the sum of its proper divisors (2936605).

19738513979 is an equidigital number, since it uses as much as digits as its factorization.

19738513979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936604.

The product of its digits is 12859560, while the sum is 62.

The spelling of 19738513979 in words is "nineteen billion, seven hundred thirty-eight million, five hundred thirteen thousand, nine hundred seventy-nine".