398242209 has 8 divisors (see below), whose sum is σ = 532392160. Its totient is φ = 264793536.

The previous prime is 398242199. The next prime is 398242231. The reversal of 398242209 is 902242893.

It is a happy number.

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

It is not a de Polignac number, because 398242209 - 2⁵ = 398242177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398242259) 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, 173992 + ... + 176265.

It is an arithmetic number, because the mean of its divisors is an integer number (66549020).

Almost surely, 2^398242209 is an apocalyptic number.

It is an amenable number.

398242209 is a deficient number, since it is larger than the sum of its proper divisors (134149951).

398242209 is a wasteful number, since it uses less digits than its factorization.

398242209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350639.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 398242209 is about 19956.0068400469. The cubic root of 398242209 is about 735.7254219788.

The spelling of 398242209 in words is "three hundred ninety-eight million, two hundred forty-two thousand, two hundred nine".