43531040 has 48 divisors (see below), whose sum is σ = 117536832. Its totient is φ = 14924544.

The previous prime is 43531027. The next prime is 43531049. The reversal of 43531040 is 4013534.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (43531049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18314 + ... + 20553.

It is an arithmetic number, because the mean of its divisors is an integer number (2448684).

Almost surely, 2^43531040 is an apocalyptic number.

43531040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43531040 is an abundant number, since it is smaller than the sum of its proper divisors (74005792).

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

43531040 is a wasteful number, since it uses less digits than its factorization.

43531040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38889 (or 38881 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 43531040 is about 6597.8056958355. The cubic root of 43531040 is about 351.7761145175.

Adding to 43531040 its reverse (4013534), we get a palindrome (47544574).

The spelling of 43531040 in words is "forty-three million, five hundred thirty-one thousand, forty".