19730864239 has 4 divisors (see below), whose sum is σ = 19731436920. Its totient is φ = 19730291560.

The previous prime is 19730864233. The next prime is 19730864243. The reversal of 19730864239 is 93246803791.

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 19730864239 - 2⁹ = 19730863727 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 (19730864233) 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, 231109 + ... + 304750.

It is an arithmetic number, because the mean of its divisors is an integer number (4932859230).

Almost surely, 2^19730864239 is an apocalyptic number.

19730864239 is a deficient number, since it is larger than the sum of its proper divisors (572681).

19730864239 is an equidigital number, since it uses as much as digits as its factorization.

19730864239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572680.

The product of its (nonzero) digits is 1959552, while the sum is 52.

Adding to 19730864239 its product of nonzero digits (1959552), we get a palindrome (19732823791).

The spelling of 19730864239 in words is "nineteen billion, seven hundred thirty million, eight hundred sixty-four thousand, two hundred thirty-nine".