231004440 has 128 divisors (see below), whose sum is σ = 777600000. Its totient is φ = 60994944.

The previous prime is 231004439. The next prime is 231004447. The reversal of 231004440 is 44400132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231004447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114561 + ... + 116559.

It is an arithmetic number, because the mean of its divisors is an integer number (6075000).

Almost surely, 2^231004440 is an apocalyptic number.

231004440 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 231004440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388800000).

231004440 is an abundant number, since it is smaller than the sum of its proper divisors (546595560).

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

231004440 is a wasteful number, since it uses less digits than its factorization.

231004440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 231004440 is about 15198.8302181451. The cubic root of 231004440 is about 613.5831750981.

Adding to 231004440 its reverse (44400132), we get a palindrome (275404572).

The spelling of 231004440 in words is "two hundred thirty-one million, four thousand, four hundred forty".