800040009 has 8 divisors (see below), whose sum is σ = 1129468320. Its totient is φ = 501985856.

The previous prime is 800039993. The next prime is 800040019. The reversal of 800040009 is 900040008.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 800040009 - 2⁴ = 800039993 is a prime.

It is a super-4 number, since 4×800040009⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (800040019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7843479 + ... + 7843580.

It is an arithmetic number, because the mean of its divisors is an integer number (141183540).

Almost surely, 2^800040009 is an apocalyptic number.

It is an amenable number.

800040009 is a deficient number, since it is larger than the sum of its proper divisors (329428311).

800040009 is a wasteful number, since it uses less digits than its factorization.

800040009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15687079.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 800040009 is about 28284.9785044995. The cubic root of 800040009 is about 928.3332419086. Note that the first 3 decimals are identical.

Subtracting 800040009 from its reverse (900040008), we obtain a palindrome (99999999).

The spelling of 800040009 in words is "eight hundred million, forty thousand, nine".