4000009 has 4 divisors (see below), whose sum is σ = 4307716.
Its totient is φ = 3692304.
The previous prime is 3999971. The next prime is 4000037. The reversal of 4000009 is 9000004.
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 595984 + 3404025 = 772^2 + 1845^2
It is a cyclic number.
It is not a de Polignac number, because 4000009 - 29 = 3999497 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 307693 = 4000009 / (4 + 0 + 0 + 0 + 0 + 0 + 9).
It is a Duffinian number.
4000009 is a modest number, since divided by 9 gives 4 as remainder.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (4000039) 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, 153834 + ... + 153859.
It is an arithmetic number, because the mean of its divisors is an integer number (1076929).
Almost surely, 24000009 is an apocalyptic number.
It is an amenable number.
4000009 is a deficient number, since it is larger than the sum of its proper divisors (307707).
4000009 is a wasteful number, since it uses less digits than its factorization.
4000009 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 307706.
The product of its (nonzero) digits is 36, while the sum is 13.
The square root of 4000009 is about 2000.0022499987.
The cubic root of 4000009 is about 158.7402242518.
The spelling of 4000009 in words is "four million, nine", and thus it is an aban number.