4128009 has 4 divisors (see below), whose sum is σ = 5504016. Its totient is φ = 2752004.

The previous prime is 4127999. The next prime is 4128013. The reversal of 4128009 is 9008214.

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 4128009 - 2⁴ = 4127993 is a prime.

It is a D-number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4128009.

It is not an unprimeable number, because it can be changed into a prime (4128049) 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, 687999 + ... + 688004.

It is an arithmetic number, because the mean of its divisors is an integer number (1376004).

Almost surely, 2^4128009 is an apocalyptic number.

It is an amenable number.

4128009 is a deficient number, since it is larger than the sum of its proper divisors (1376007).

4128009 is a wasteful number, since it uses less digits than its factorization.

4128009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376006.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 4128009 is about 2031.7502307124. The cubic root of 4128009 is about 160.4157028633.

The spelling of 4128009 in words is "four million, one hundred twenty-eight thousand, nine".