43545940 has 12 divisors (see below), whose sum is σ = 91446516. Its totient is φ = 17418368.

The previous prime is 43545911. The next prime is 43545949. The reversal of 43545940 is 4954534.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31945104 + 11600836 = 5652^2 + 3406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43545896 and 43545905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43545949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088629 + ... + 1088668.

It is an arithmetic number, because the mean of its divisors is an integer number (7620543).

Almost surely, 2^43545940 is an apocalyptic number.

It is an amenable number.

43545940 is an abundant number, since it is smaller than the sum of its proper divisors (47900576).

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

43545940 is a wasteful number, since it uses less digits than its factorization.

43545940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177306 (or 2177304 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 43545940 is about 6598.9347625204. The cubic root of 43545940 is about 351.8162457755.

The spelling of 43545940 in words is "forty-three million, five hundred forty-five thousand, nine hundred forty".