231434240 has 96 divisors (see below), whose sum is σ = 563439240. Its totient is φ = 91226112.

The previous prime is 231434233. The next prime is 231434263. The reversal of 231434240 is 42434132.

It can be written as a sum of positive squares in 4 ways, for example, as 147088384 + 84345856 = 12128^2 + 9184^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 993164 + ... + 993396.

Almost surely, 2^231434240 is an apocalyptic number.

231434240 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 231434240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281719620).

231434240 is an abundant number, since it is smaller than the sum of its proper divisors (332005000).

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

231434240 is an equidigital number, since it uses as much as digits as its factorization.

231434240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 231434240 is about 15212.9628935326. The cubic root of 231434240 is about 613.9634775462.

Adding to 231434240 its reverse (42434132), we get a palindrome (273868372).

The spelling of 231434240 in words is "two hundred thirty-one million, four hundred thirty-four thousand, two hundred forty".