19730509789 has 4 divisors (see below), whose sum is σ = 19730888380. Its totient is φ = 19730131200.

The previous prime is 19730509787. The next prime is 19730509801. The reversal of 19730509789 is 98790503791.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18119852100 + 1610657689 = 134610^2 + 40133^2 .

It is a cyclic number.

It is not a de Polignac number, because 19730509789 - 2¹ = 19730509787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19730509781) 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 3 ways as a sum of consecutive naturals, for example, 95694 + ... + 220495.

It is an arithmetic number, because the mean of its divisors is an integer number (4932722095).

Almost surely, 2^19730509789 is an apocalyptic number.

It is an amenable number.

19730509789 is a deficient number, since it is larger than the sum of its proper divisors (378591).

19730509789 is an equidigital number, since it uses as much as digits as its factorization.

19730509789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378590.

The product of its (nonzero) digits is 4286520, while the sum is 58.

The spelling of 19730509789 in words is "nineteen billion, seven hundred thirty million, five hundred nine thousand, seven hundred eighty-nine".