43243440 has 40 divisors (see below), whose sum is σ = 134055408. Its totient is φ = 11531520.

The previous prime is 43243429. The next prime is 43243441. The reversal of 43243440 is 4434234.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 43243440.

It is not an unprimeable number, because it can be changed into a prime (43243441) 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, 89851 + ... + 90330.

Almost surely, 2^43243440 is an apocalyptic number.

43243440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43243440 is an abundant number, since it is smaller than the sum of its proper divisors (90811968).

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

43243440 is a wasteful number, since it uses less digits than its factorization.

43243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180197 (or 180191 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

The square root of 43243440 is about 6575.9744525051. The cubic root of 43243440 is about 350.9996996775. Note that the first 3 decimals are identical.

Adding to 43243440 its reverse (4434234), we get a palindrome (47677674).

The spelling of 43243440 in words is "forty-three million, two hundred forty-three thousand, four hundred forty".