405000009 has 24 divisors (see below), whose sum is σ = 601185312. Its totient is φ = 262572480.

The previous prime is 404999983. The next prime is 405000041. The reversal of 405000009 is 900000504.

It is not a de Polignac number, because 405000009 - 2⁸ = 404999753 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 404999955 and 405000000.

It is not an unprimeable number, because it can be changed into a prime (405000049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126462 + ... + 129624.

It is an arithmetic number, because the mean of its divisors is an integer number (25049388).

Almost surely, 2^405000009 is an apocalyptic number.

It is an amenable number.

405000009 is a deficient number, since it is larger than the sum of its proper divisors (196185303).

405000009 is a wasteful number, since it uses less digits than its factorization.

405000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557 (or 3554 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 405000009 is about 20124.6120211049. The cubic root of 405000009 is about 739.8636277796.

The spelling of 405000009 in words is "four hundred five million, nine", and thus it is an aban number.