43420009 has 4 divisors (see below), whose sum is σ = 43638400. Its totient is φ = 43201620.

The previous prime is 43420007. The next prime is 43420031. The reversal of 43420009 is 90002434.

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: 90002434 = 2 ⋅45001217.

It is a cyclic number.

It is not a de Polignac number, because 43420009 - 2¹ = 43420007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43420007) 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, 108897 + ... + 109294.

It is an arithmetic number, because the mean of its divisors is an integer number (10909600).

Almost surely, 2^43420009 is an apocalyptic number.

It is an amenable number.

43420009 is a deficient number, since it is larger than the sum of its proper divisors (218391).

43420009 is a wasteful number, since it uses less digits than its factorization.

43420009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218390.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 43420009 is about 6589.3860867307. The cubic root of 43420009 is about 351.4767778581.

The spelling of 43420009 in words is "forty-three million, four hundred twenty thousand, nine".