823988231 has 16 divisors (see below), whose sum is σ = 921212160. Its totient is φ = 730537920.

The previous prime is 823988197. The next prime is 823988233. The reversal of 823988231 is 132889328.

It is a cyclic number.

It is not a de Polignac number, because 823988231 - 2⁶ = 823988167 is a prime.

It is a super-2 number, since 2×823988231² = 1357913209653018722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823988233) 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, 533246 + ... + 534788.

It is an arithmetic number, because the mean of its divisors is an integer number (57575760).

Almost surely, 2^823988231 is an apocalyptic number.

823988231 is a deficient number, since it is larger than the sum of its proper divisors (97223929).

823988231 is a wasteful number, since it uses less digits than its factorization.

823988231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726.

The product of its digits is 165888, while the sum is 44.

The square root of 823988231 is about 28705.1951918115. The cubic root of 823988231 is about 937.5051660989.

The spelling of 823988231 in words is "eight hundred twenty-three million, nine hundred eighty-eight thousand, two hundred thirty-one".