398262209 has 2 divisors, whose sum is σ = 398262210. Its totient is φ = 398262208.

The previous prime is 398262203. The next prime is 398262223. The reversal of 398262209 is 902262893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395890609 + 2371600 = 19897^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 398262209 - 2⁸ = 398261953 is a prime.

It is a super-2 number, since 2×398262209² = 317225574235119362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398262203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199131104 + 199131105.

It is an arithmetic number, because the mean of its divisors is an integer number (199131105).

Almost surely, 2^398262209 is an apocalyptic number.

It is an amenable number.

398262209 is a deficient number, since it is larger than the sum of its proper divisors (1).

398262209 is an equidigital number, since it uses as much as digits as its factorization.

398262209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 398262209 is about 19956.5079360092. The cubic root of 398262209 is about 735.7377379864.

The spelling of 398262209 in words is "three hundred ninety-eight million, two hundred sixty-two thousand, two hundred nine".