405040009 has 8 divisors (see below), whose sum is σ = 442025280. Its totient is φ = 368082000.

The previous prime is 405040007. The next prime is 405040033. The reversal of 405040009 is 900040504.

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

It is not a de Polignac number, because 405040009 - 2¹ = 405040007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405040001) 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, 35959 + ... + 45859.

It is an arithmetic number, because the mean of its divisors is an integer number (55253160).

Almost surely, 2^405040009 is an apocalyptic number.

It is an amenable number.

405040009 is a deficient number, since it is larger than the sum of its proper divisors (36985271).

405040009 is a wasteful number, since it uses less digits than its factorization.

405040009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13631.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 405040009 is about 20125.6058045466. The cubic root of 405040009 is about 739.8879846275.

Multiplying 405040009 by its sum of digits (22), we get a palindrome (8910880198).

The spelling of 405040009 in words is "four hundred five million, forty thousand, nine".