43545421 has 8 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 42051360.

The previous prime is 43545407. The next prime is 43545457. The reversal of 43545421 is 12454534.

43545421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43545421 - 2⁵ = 43545389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43545421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43545401) 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 7 ways as a sum of consecutive naturals, for example, 17001 + ... + 19393.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^43545421 is an apocalyptic number.

It is an amenable number.

43545421 is a deficient number, since it is larger than the sum of its proper divisors (1500083).

43545421 is a wasteful number, since it uses less digits than its factorization.

43545421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 9600, while the sum is 28.

The square root of 43545421 is about 6598.8954378744. The cubic root of 43545421 is about 351.8148480688.

Adding to 43545421 its reverse (12454534), we get a palindrome (55999955).

The spelling of 43545421 in words is "forty-three million, five hundred forty-five thousand, four hundred twenty-one".