10099865 has 4 divisors (see below), whose sum is σ = 12119844. Its totient is φ = 8079888.

The previous prime is 10099861. The next prime is 10099867. The reversal of 10099865 is 56899001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56899001 = 6637 ⋅8573.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 3829849 = 2504^2 + 1957^2 .

It is a cyclic number.

It is not a de Polignac number, because 10099865 - 2² = 10099861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10099861) 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, 1009982 + ... + 1009991.

It is an arithmetic number, because the mean of its divisors is an integer number (3029961).

Almost surely, 2^10099865 is an apocalyptic number.

It is an amenable number.

10099865 is a deficient number, since it is larger than the sum of its proper divisors (2019979).

10099865 is an equidigital number, since it uses as much as digits as its factorization.

10099865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019978.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 10099865 is about 3178.0284769020. The cubic root of 10099865 is about 216.1582702045.

The spelling of 10099865 in words is "ten million, ninety-nine thousand, eight hundred sixty-five".