420009 has 8 divisors (see below), whose sum is σ = 563712. Its totient is φ = 278160.

The previous prime is 420001. The next prime is 420029. The reversal of 420009 is 900024.

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

It is not a de Polignac number, because 420009 - 2³ = 420001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420009.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420009.

It is not an unprimeable number, because it can be changed into a prime (420001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207 + ... + 939.

It is an arithmetic number, because the mean of its divisors is an integer number (70464).

2⁴²⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

420009 is a deficient number, since it is larger than the sum of its proper divisors (143703).

420009 is a wasteful number, since it uses less digits than its factorization.

420009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 420009 is about 648.0810134543. The cubic root of 420009 is about 74.8892587878.

Adding to 420009 its sum of digits (15), we get a palindrome (420024).

The spelling of 420009 in words is "four hundred twenty thousand, nine".