231993823 has 4 divisors (see below), whose sum is σ = 239993640. Its totient is φ = 223994008.

The previous prime is 231993793. The next prime is 231993829. The reversal of 231993823 is 328399132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231993823 - 2⁵ = 231993791 is a prime.

It is a super-2 number, since 2×231993823² = 107642267820310658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231993829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3999865 + ... + 3999922.

It is an arithmetic number, because the mean of its divisors is an integer number (59998410).

Almost surely, 2^231993823 is an apocalyptic number.

231993823 is a deficient number, since it is larger than the sum of its proper divisors (7999817).

231993823 is an equidigital number, since it uses as much as digits as its factorization.

231993823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999816.

The product of its digits is 69984, while the sum is 40.

The square root of 231993823 is about 15231.3434404192. The cubic root of 231993823 is about 614.4579117264.

The spelling of 231993823 in words is "two hundred thirty-one million, nine hundred ninety-three thousand, eight hundred twenty-three".