99876209 has 4 divisors (see below), whose sum is σ = 102575604. Its totient is φ = 97176816.

The previous prime is 99876181. The next prime is 99876211. The reversal of 99876209 is 90267899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81360400 + 18515809 = 9020^2 + 4303^2 .

It is a cyclic number.

It is not a de Polignac number, because 99876209 - 2¹⁶ = 99810673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99876299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349642 + ... + 1349715.

It is an arithmetic number, because the mean of its divisors is an integer number (25643901).

Almost surely, 2^99876209 is an apocalyptic number.

It is an amenable number.

99876209 is a deficient number, since it is larger than the sum of its proper divisors (2699395).

99876209 is a wasteful number, since it uses less digits than its factorization.

99876209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699394.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 99876209 is about 9993.8085332870. The cubic root of 99876209 is about 463.9672753006.

The spelling of 99876209 in words is "ninety-nine million, eight hundred seventy-six thousand, two hundred nine".