405390009 has 4 divisors (see below), whose sum is σ = 540520016. Its totient is φ = 270260004.

The previous prime is 405389981. The next prime is 405390017. The reversal of 405390009 is 900093504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 405390009 - 2¹² = 405385913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405290009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67564999 + ... + 67565004.

It is an arithmetic number, because the mean of its divisors is an integer number (135130004).

Almost surely, 2^405390009 is an apocalyptic number.

It is an amenable number.

405390009 is a deficient number, since it is larger than the sum of its proper divisors (135130007).

405390009 is a wasteful number, since it uses less digits than its factorization.

405390009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135130006.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 405390009 is about 20134.2993173341. The cubic root of 405390009 is about 740.1010386751.

The spelling of 405390009 in words is "four hundred five million, three hundred ninety thousand, nine".