19740259979 has 8 divisors (see below), whose sum is σ = 22471126272. Its totient is φ = 17165443240.

The previous prime is 19740259967. The next prime is 19740259999. The reversal of 19740259979 is 97995204791.

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

It is a de Polignac number, because none of the positive numbers 2^k-19740259979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19740259909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39012119 + ... + 39012624.

It is an arithmetic number, because the mean of its divisors is an integer number (2808890784).

Almost surely, 2^19740259979 is an apocalyptic number.

19740259979 is a deficient number, since it is larger than the sum of its proper divisors (2730866293).

19740259979 is a wasteful number, since it uses less digits than its factorization.

19740259979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78024777.

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

The spelling of 19740259979 in words is "nineteen billion, seven hundred forty million, two hundred fifty-nine thousand, nine hundred seventy-nine".