12099869 has 4 divisors (see below), whose sum is σ = 12811644. Its totient is φ = 11388096.

The previous prime is 12099859. The next prime is 12099883. The reversal of 12099869 is 96899021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96899021 = 149 ⋅650329.

It can be written as a sum of positive squares in 2 ways, for example, as 4674244 + 7425625 = 2162^2 + 2725^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12099869 is a prime.

It is a super-2 number, since 2×12099869² = 292813659634322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12099809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355862 + ... + 355895.

It is an arithmetic number, because the mean of its divisors is an integer number (3202911).

Almost surely, 2^12099869 is an apocalyptic number.

It is an amenable number.

12099869 is a deficient number, since it is larger than the sum of its proper divisors (711775).

12099869 is an equidigital number, since it uses as much as digits as its factorization.

12099869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711774.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 12099869 is about 3478.4865962082. The cubic root of 12099869 is about 229.5762139624.

The spelling of 12099869 in words is "twelve million, ninety-nine thousand, eight hundred sixty-nine".