390500009 has 4 divisors (see below), whose sum is σ = 391772304. Its totient is φ = 389227716.

The previous prime is 390499999. The next prime is 390500023. The reversal of 390500009 is 900005093.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390500009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390500809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635687 + ... + 636300.

It is an arithmetic number, because the mean of its divisors is an integer number (97943076).

Almost surely, 2^390500009 is an apocalyptic number.

It is an amenable number.

390500009 is a deficient number, since it is larger than the sum of its proper divisors (1272295).

390500009 is a wasteful number, since it uses less digits than its factorization.

390500009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272294.

The product of its (nonzero) digits is 1215, while the sum is 26.

The square root of 390500009 is about 19761.0730730899. The cubic root of 390500009 is about 730.9264580435.

The spelling of 390500009 in words is "three hundred ninety million, five hundred thousand, nine".