3943509 has 4 divisors (see below), whose sum is σ = 5258016. Its totient is φ = 2629004.

The previous prime is 3943481. The next prime is 3943517. The reversal of 3943509 is 9053493.

3943509 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 3943509 - 2²¹ = 1846357 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3943509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657249 + ... + 657254.

It is an arithmetic number, because the mean of its divisors is an integer number (1314504).

Almost surely, 2^3943509 is an apocalyptic number.

It is an amenable number.

3943509 is a deficient number, since it is larger than the sum of its proper divisors (1314507).

3943509 is a wasteful number, since it uses less digits than its factorization.

3943509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314506.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 3943509 is about 1985.8270317427. The cubic root of 3943509 is about 157.9892771658.

The spelling of 3943509 in words is "three million, nine hundred forty-three thousand, five hundred nine".