12099809 has 2 divisors, whose sum is σ = 12099810. Its totient is φ = 12099808.

The previous prime is 12099803. The next prime is 12099839. The reversal of 12099809 is 90899021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 1763584 = 3215^2 + 1328^2 .

It is a cyclic number.

It is not a de Polignac number, because 12099809 - 2¹⁶ = 12034273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12099803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6049904 + 6049905.

It is an arithmetic number, because the mean of its divisors is an integer number (6049905).

Almost surely, 2^12099809 is an apocalyptic number.

It is an amenable number.

12099809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12099809 is an equidigital number, since it uses as much as digits as its factorization.

12099809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 12099809 is about 3478.4779717572. The cubic root of 12099809 is about 229.5758344928.

The spelling of 12099809 in words is "twelve million, ninety-nine thousand, eight hundred nine".