398287209 has 16 divisors (see below), whose sum is σ = 548705664. Its totient is φ = 256838400.

The previous prime is 398287207. The next prime is 398287231. The reversal of 398287209 is 902782893.

It is a happy number.

It is not a de Polignac number, because 398287209 - 2¹ = 398287207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398287207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6352 + ... + 28929.

It is an arithmetic number, because the mean of its divisors is an integer number (34294104).

Almost surely, 2^398287209 is an apocalyptic number.

It is an amenable number.

398287209 is a deficient number, since it is larger than the sum of its proper divisors (150418455).

398287209 is a wasteful number, since it uses less digits than its factorization.

398287209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35408.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 398287209 is about 19957.1342882689. The cubic root of 398287209 is about 735.7531324159.

The spelling of 398287209 in words is "three hundred ninety-eight million, two hundred eighty-seven thousand, two hundred nine".