43240340 has 72 divisors (see below), whose sum is σ = 107358048. Its totient is φ = 14501760.

The previous prime is 43240339. The next prime is 43240343. The reversal of 43240340 is 4304234.

It is a happy number.

43240340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43240343) 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 23 ways as a sum of consecutive naturals, for example, 36599 + ... + 37761.

It is an arithmetic number, because the mean of its divisors is an integer number (1491084).

Almost surely, 2^43240340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43240340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53679024).

43240340 is an abundant number, since it is smaller than the sum of its proper divisors (64117708).

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

43240340 is a wasteful number, since it uses less digits than its factorization.

43240340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 43240340 is about 6575.7387417689. The cubic root of 43240340 is about 350.9913120849.

Adding to 43240340 its reverse (4304234), we get a palindrome (47544574).

The spelling of 43240340 in words is "forty-three million, two hundred forty thousand, three hundred forty".