43013909 has 4 divisors (see below), whose sum is σ = 43047840. Its totient is φ = 42979980.

The previous prime is 43013903. The next prime is 43013911. The reversal of 43013909 is 90931034.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90931034 = 2 ⋅45465517.

It is a cyclic number.

It is not a de Polignac number, because 43013909 - 2⁸ = 43013653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43013903) 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, 14987 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (10761960).

Almost surely, 2^43013909 is an apocalyptic number.

It is an amenable number.

43013909 is a deficient number, since it is larger than the sum of its proper divisors (33931).

43013909 is a wasteful number, since it uses less digits than its factorization.

43013909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33930.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 43013909 is about 6558.4989898604. The cubic root of 43013909 is about 350.3775762019.

The spelling of 43013909 in words is "forty-three million, thirteen thousand, nine hundred nine".