43520340 has 48 divisors (see below), whose sum is σ = 129028032. Its totient is φ = 10922496.

The previous prime is 43520333. The next prime is 43520341. The reversal of 43520340 is 4302534.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43520341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20314 + ... + 22353.

It is an arithmetic number, because the mean of its divisors is an integer number (2688084).

Almost surely, 2^43520340 is an apocalyptic number.

It is an amenable number.

43520340 is an abundant number, since it is smaller than the sum of its proper divisors (85507692).

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

43520340 is a wasteful number, since it uses less digits than its factorization.

43520340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42696 (or 42694 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 43520340 is about 6596.9947703481. The cubic root of 43520340 is about 351.7472897765.

Adding to 43520340 its reverse (4302534), we get a palindrome (47822874).

The spelling of 43520340 in words is "forty-three million, five hundred twenty thousand, three hundred forty".