998400217 has 2 divisors, whose sum is σ = 998400218. Its totient is φ = 998400216.

The previous prime is 998400149. The next prime is 998400233. The reversal of 998400217 is 712004899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932935936 + 65464281 = 30544^2 + 8091^2 .

It is a cyclic number.

It is not a de Polignac number, because 998400217 - 2¹¹ = 998398169 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998400217.

It is not a weakly prime, because it can be changed into another prime (998400257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499200108 + 499200109.

It is an arithmetic number, because the mean of its divisors is an integer number (499200109).

Almost surely, 2^998400217 is an apocalyptic number.

It is an amenable number.

998400217 is a deficient number, since it is larger than the sum of its proper divisors (1).

998400217 is an equidigital number, since it uses as much as digits as its factorization.

998400217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 998400217 is about 31597.4716868296. The cubic root of 998400217 is about 999.4664543797.

The spelling of 998400217 in words is "nine hundred ninety-eight million, four hundred thousand, two hundred seventeen".