390009 has 4 divisors (see below), whose sum is σ = 520016. Its totient is φ = 260004.

The previous prime is 390001. The next prime is 390043. The reversal of 390009 is 900093.

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 390009 - 2³ = 390001 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390001) 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, 64999 + ... + 65004.

It is an arithmetic number, because the mean of its divisors is an integer number (130004).

2³⁹⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

390009 is a deficient number, since it is larger than the sum of its proper divisors (130007).

390009 is a wasteful number, since it uses less digits than its factorization.

390009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130006.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 390009 is about 624.5070055652. The cubic root of 390009 is about 73.0619977473.

The spelling of 390009 in words is "three hundred ninety thousand, nine".