408998209 has 2 divisors, whose sum is σ = 408998210. Its totient is φ = 408998208.

The previous prime is 408998179. The next prime is 408998231. The reversal of 408998209 is 902899804.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401000625 + 7997584 = 20025^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 408998209 - 2¹³ = 408990017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (408998299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204499104 + 204499105.

It is an arithmetic number, because the mean of its divisors is an integer number (204499105).

Almost surely, 2^408998209 is an apocalyptic number.

It is an amenable number.

408998209 is a deficient number, since it is larger than the sum of its proper divisors (1).

408998209 is an equidigital number, since it uses as much as digits as its factorization.

408998209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 408998209 is about 20223.7041364830. The cubic root of 408998209 is about 742.2903285507.

The spelling of 408998209 in words is "four hundred eight million, nine hundred ninety-eight thousand, two hundred nine".