99998209 has 4 divisors (see below), whose sum is σ = 100025604. Its totient is φ = 99970816.

The previous prime is 99998207. The next prime is 99998231. The reversal of 99998209 is 90289999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90289999 = 563 ⋅160373.

It can be written as a sum of positive squares in 2 ways, for example, as 44823025 + 55175184 = 6695^2 + 7428^2 .

It is a cyclic number.

It is not a de Polignac number, because 99998209 - 2¹ = 99998207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99998209.

It is not an unprimeable number, because it can be changed into a prime (99998207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7192 + ... + 15865.

It is an arithmetic number, because the mean of its divisors is an integer number (25006401).

Almost surely, 2^99998209 is an apocalyptic number.

It is an amenable number.

99998209 is a deficient number, since it is larger than the sum of its proper divisors (27395).

99998209 is a wasteful number, since it uses less digits than its factorization.

99998209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27394.

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 99998209 is about 9999.9104495990. The cubic root of 99998209 is about 464.1561123162.

The spelling of 99998209 in words is "ninety-nine million, nine hundred ninety-eight thousand, two hundred nine".