9943679523 has 16 divisors (see below), whose sum is σ = 13584257280. Its totient is φ = 6466512864.

The previous prime is 9943679513. The next prime is 9943679527. The reversal of 9943679523 is 3259763499.

It is a happy number.

It is a Cunningham number, because it is equal to 99718²-1.

It is not a de Polignac number, because 9943679523 - 2⁸ = 9943679267 is a prime.

It is a super-2 number, since 2×9943679523² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9943679527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49858 + ... + 149576.

It is an arithmetic number, because the mean of its divisors is an integer number (849016080).

Almost surely, 2^9943679523 is an apocalyptic number.

9943679523 is a deficient number, since it is larger than the sum of its proper divisors (3640577757).

9943679523 is a wasteful number, since it uses less digits than its factorization.

9943679523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100538.

The product of its digits is 11022480, while the sum is 57.

The square root of 9943679523 is about 99717.9999949859. Note that the first 5 decimals coincide. The cubic root of 9943679523 is about 2150.3824466942.

The spelling of 9943679523 in words is "nine billion, nine hundred forty-three million, six hundred seventy-nine thousand, five hundred twenty-three".