43243640 has 64 divisors (see below), whose sum is σ = 109836000. Its totient is φ = 15178240.

The previous prime is 43243621. The next prime is 43243649. The reversal of 43243640 is 4634234.

43243640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43243649) 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 15 ways as a sum of consecutive naturals, for example, 11066 + ... + 14454.

Almost surely, 2^43243640 is an apocalyptic number.

43243640 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 43243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54918000).

43243640 is an abundant number, since it is smaller than the sum of its proper divisors (66592360).

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

43243640 is a wasteful number, since it uses less digits than its factorization.

43243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440 (or 3436 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 43243640 is about 6575.9896593593. The cubic root of 43243640 is about 351.0002407987. Note that the first 3 decimals are identical.

Adding to 43243640 its reverse (4634234), we get a palindrome (47877874).

The spelling of 43243640 in words is "forty-three million, two hundred forty-three thousand, six hundred forty".