43131040 has 96 divisors (see below), whose sum is σ = 109653264. Its totient is φ = 15974400.

The previous prime is 43131037. The next prime is 43131041. The reversal of 43131040 is 4013134.

It can be written as a sum of positive squares in 8 ways, for example, as 32398864 + 10732176 = 5692^2 + 3276^2 .

It is a super-2 number, since 2×43131040² = 3720573222963200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (43131041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274642 + ... + 274798.

Almost surely, 2^43131040 is an apocalyptic number.

43131040 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 43131040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54826632).

43131040 is an abundant number, since it is smaller than the sum of its proper divisors (66522224).

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

43131040 is a wasteful number, since it uses less digits than its factorization.

43131040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 43131040 is about 6567.4226299211. The cubic root of 43131040 is about 350.6953252050.

Adding to 43131040 its reverse (4013134), we get a palindrome (47144174).

The spelling of 43131040 in words is "forty-three million, one hundred thirty-one thousand, forty".