99940209 has 16 divisors (see below), whose sum is σ = 140481600. Its totient is φ = 63023616.

The previous prime is 99940201. The next prime is 99940223. The reversal of 99940209 is 90204999.

It is not a de Polignac number, because 99940209 - 2³ = 99940201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99940201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63577 + ... + 65129.

It is an arithmetic number, because the mean of its divisors is an integer number (8780100).

Almost surely, 2^99940209 is an apocalyptic number.

It is an amenable number.

99940209 is a deficient number, since it is larger than the sum of its proper divisors (40541391).

99940209 is a wasteful number, since it uses less digits than its factorization.

99940209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2704.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 99940209 is about 9997.0100029959. The cubic root of 99940209 is about 464.0663565053.

The spelling of 99940209 in words is "ninety-nine million, nine hundred forty thousand, two hundred nine".