231023040 has 112 divisors (see below), whose sum is σ = 765462528. Its totient is φ = 58921984.

The previous prime is 231023021. The next prime is 231023041. The reversal of 231023040 is 40320132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231023041) 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, 16849 + ... + 27311.

Almost surely, 2^231023040 is an apocalyptic number.

231023040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231023040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382731264).

231023040 is an abundant number, since it is smaller than the sum of its proper divisors (534439488).

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

231023040 is a wasteful number, since it uses less digits than its factorization.

231023040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506 (or 10496 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 231023040 is about 15199.4420950244. The cubic root of 231023040 is about 613.5996428057.

Adding to 231023040 its reverse (40320132), we get a palindrome (271343172).

The spelling of 231023040 in words is "two hundred thirty-one million, twenty-three thousand, forty".