40543909 has 4 divisors (see below), whose sum is σ = 46335904. Its totient is φ = 34751916.

The previous prime is 40543901. The next prime is 40543927. The reversal of 40543909 is 90934504.

40543909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40543909 - 2³ = 40543901 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 (40543901) 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 3 ways as a sum of consecutive naturals, for example, 2895987 + ... + 2896000.

It is an arithmetic number, because the mean of its divisors is an integer number (11583976).

Almost surely, 2^40543909 is an apocalyptic number.

It is an amenable number.

40543909 is a deficient number, since it is larger than the sum of its proper divisors (5791995).

40543909 is an equidigital number, since it uses as much as digits as its factorization.

40543909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791994.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 40543909 is about 6367.4099129866. The cubic root of 40543909 is about 343.5383347510.

The spelling of 40543909 in words is "forty million, five hundred forty-three thousand, nine hundred nine".