9999523 has 8 divisors (see below), whose sum is σ = 10140768. Its totient is φ = 9859584.

The previous prime is 9999511. The next prime is 9999533. The reversal of 9999523 is 3259999.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999523 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37890 + ... + 38152.

It is an arithmetic number, because the mean of its divisors is an integer number (1267596).

Almost surely, 2^9999523 is an apocalyptic number.

9999523 is a deficient number, since it is larger than the sum of its proper divisors (141245).

9999523 is a wasteful number, since it uses less digits than its factorization.

9999523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

The product of its digits is 196830, while the sum is 46.

The square root of 9999523 is about 3162.2022389468. The cubic root of 9999523 is about 215.4400433976.

The spelling of 9999523 in words is "nine million, nine hundred ninety-nine thousand, five hundred twenty-three".