43453909 has 4 divisors (see below), whose sum is σ = 44855680. Its totient is φ = 42052140.

The previous prime is 43453889. The next prime is 43453933. The reversal of 43453909 is 90935434.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43453909 - 2¹¹ = 43451861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43453979) 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, 700839 + ... + 700900.

It is an arithmetic number, because the mean of its divisors is an integer number (11213920).

Almost surely, 2^43453909 is an apocalyptic number.

It is an amenable number.

43453909 is a deficient number, since it is larger than the sum of its proper divisors (1401771).

43453909 is a wasteful number, since it uses less digits than its factorization.

43453909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401770.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 43453909 is about 6591.9579033850. The cubic root of 43453909 is about 351.5682254304.

The spelling of 43453909 in words is "forty-three million, four hundred fifty-three thousand, nine hundred nine".