231993828 has 48 divisors (see below), whose sum is σ = 656147520. Its totient is φ = 70300800.

The previous prime is 231993793. The next prime is 231993829. The reversal of 231993828 is 828399132.

It is a super-2 number, since 2×231993828² = 107642272460187168, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96453 + ... + 98828.

It is an arithmetic number, because the mean of its divisors is an integer number (13669740).

Almost surely, 2^231993828 is an apocalyptic number.

It is an amenable number.

231993828 is an abundant number, since it is smaller than the sum of its proper divisors (424153692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231993828 is a wasteful number, since it uses less digits than its factorization.

231993828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195305 (or 195297 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 231993828 is about 15231.3436045544. The cubic root of 231993828 is about 614.4579161407.

The spelling of 231993828 in words is "two hundred thirty-one million, nine hundred ninety-three thousand, eight hundred twenty-eight".