9729431923 has 4 divisors (see below), whose sum is σ = 9732864240. Its totient is φ = 9725999608.

The previous prime is 9729431839. The next prime is 9729431947. The reversal of 9729431923 is 3291349279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3291349279 = 59 ⋅55785581.

It is a cyclic number.

It is not a de Polignac number, because 9729431923 - 2¹⁷ = 9729300851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9729431983) 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, 1711903 + ... + 1717576.

It is an arithmetic number, because the mean of its divisors is an integer number (2433216060).

Almost surely, 2^9729431923 is an apocalyptic number.

9729431923 is a deficient number, since it is larger than the sum of its proper divisors (3432317).

9729431923 is a wasteful number, since it uses less digits than its factorization.

9729431923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432316.

The product of its digits is 734832, while the sum is 49.

The square root of 9729431923 is about 98637.8827986489. The cubic root of 9729431923 is about 2134.8260546747.

The spelling of 9729431923 in words is "nine billion, seven hundred twenty-nine million, four hundred thirty-one thousand, nine hundred twenty-three".