43400009 has 4 divisors (see below), whose sum is σ = 45684240. Its totient is φ = 41115780.

The previous prime is 43399973. The next prime is 43400051. The reversal of 43400009 is 90000434.

43400009 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 43400009 - 2²⁴ = 26622793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43400089) 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, 1142087 + ... + 1142124.

It is an arithmetic number, because the mean of its divisors is an integer number (11421060).

Almost surely, 2^43400009 is an apocalyptic number.

It is an amenable number.

43400009 is a deficient number, since it is larger than the sum of its proper divisors (2284231).

43400009 is a wasteful number, since it uses less digits than its factorization.

43400009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284230.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 43400009 is about 6587.8683198740. The cubic root of 43400009 is about 351.4228041618.

The spelling of 43400009 in words is "forty-three million, four hundred thousand, nine".