98400209 has 2 divisors, whose sum is σ = 98400210. Its totient is φ = 98400208.

The previous prime is 98400193. The next prime is 98400217. The reversal of 98400209 is 90200489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91393600 + 7006609 = 9560^2 + 2647^2 .

It is an emirp because it is prime and its reverse (90200489) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98400209 - 2⁴ = 98400193 is a prime.

It is a super-2 number, since 2×98400209² = 19365202262487362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (98400229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49200104 + 49200105.

It is an arithmetic number, because the mean of its divisors is an integer number (49200105).

Almost surely, 2^98400209 is an apocalyptic number.

It is an amenable number.

98400209 is a deficient number, since it is larger than the sum of its proper divisors (1).

98400209 is an equidigital number, since it uses as much as digits as its factorization.

98400209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 98400209 is about 9919.6879487210. The cubic root of 98400209 is about 461.6703748104.

The spelling of 98400209 in words is "ninety-eight million, four hundred thousand, two hundred nine".