43231320 has 160 divisors (see below), whose sum is σ = 158645520. Its totient is φ = 10471680.

The previous prime is 43231319. The next prime is 43231361. The reversal of 43231320 is 2313234.

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

It is a junction number, because it is equal to n+sod(n) for n = 43231293 and 43231302.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 35034 + ... + 36246.

Almost surely, 2^43231320 is an apocalyptic number.

43231320 is a gapful number since it is divisible by the number (40) 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 43231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79322760).

43231320 is an abundant number, since it is smaller than the sum of its proper divisors (115414200).

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

43231320 is a wasteful number, since it uses less digits than its factorization.

43231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 43231320 is about 6575.0528514986. The cubic root of 43231320 is about 350.9669046157.

Adding to 43231320 its reverse (2313234), we get a palindrome (45544554).

The spelling of 43231320 in words is "forty-three million, two hundred thirty-one thousand, three hundred twenty".