999256823 has 8 divisors (see below), whose sum is σ = 1006712496. Its totient is φ = 991820800.

The previous prime is 999256813. The next prime is 999256829. The reversal of 999256823 is 328652999.

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

It is a cyclic number.

It is not a de Polignac number, because 999256823 - 2⁴ = 999256807 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 (999256829) 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, 106388 + ... + 115398.

It is an arithmetic number, because the mean of its divisors is an integer number (125839062).

Almost surely, 2^999256823 is an apocalyptic number.

999256823 is a deficient number, since it is larger than the sum of its proper divisors (7455673).

999256823 is a wasteful number, since it uses less digits than its factorization.

999256823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9825.

The product of its digits is 2099520, while the sum is 53.

The square root of 999256823 is about 31611.0237575438. The cubic root of 999256823 is about 999.7522129400.

The spelling of 999256823 in words is "nine hundred ninety-nine million, two hundred fifty-six thousand, eight hundred twenty-three".