43013209 has 4 divisors (see below), whose sum is σ = 43557760. Its totient is φ = 42468660.

The previous prime is 43013189. The next prime is 43013219. The reversal of 43013209 is 90231034.

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 43013209 - 2²⁵ = 9458777 is a prime.

It is a super-2 number, since 2×43013209² = 3700272296955362, which contains 22 as substring.

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 43013209.

It is not an unprimeable number, because it can be changed into a prime (43013219) 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, 272157 + ... + 272314.

It is an arithmetic number, because the mean of its divisors is an integer number (10889440).

Almost surely, 2^43013209 is an apocalyptic number.

It is an amenable number.

43013209 is a deficient number, since it is larger than the sum of its proper divisors (544551).

43013209 is an equidigital number, since it uses as much as digits as its factorization.

43013209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544550.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 43013209 is about 6558.4456237740. The cubic root of 43013209 is about 350.3756755327.

The spelling of 43013209 in words is "forty-three million, thirteen thousand, two hundred nine".