99990209 has 8 divisors (see below), whose sum is σ = 115496928. Its totient is φ = 85552960.

The previous prime is 99990181. The next prime is 99990239. The reversal of 99990209 is 90209999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99990209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99990239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267167 + ... + 267540.

It is an arithmetic number, because the mean of its divisors is an integer number (14437116).

Almost surely, 2^99990209 is an apocalyptic number.

It is an amenable number.

99990209 is a deficient number, since it is larger than the sum of its proper divisors (15506719).

99990209 is a wasteful number, since it uses less digits than its factorization.

99990209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534735.

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 99990209 is about 9999.5104380165. The cubic root of 99990209 is about 464.1437342681.

The spelling of 99990209 in words is "ninety-nine million, nine hundred ninety thousand, two hundred nine".