10003865 has 8 divisors (see below), whose sum is σ = 12058440. Its totient is φ = 7967232.

The previous prime is 10003859. The next prime is 10003879. The reversal of 10003865 is 56830001.

10003865 = 2236² + 2237².

10003865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2474329 + 7529536 = 1573^2 + 2744^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10003865 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10003865.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3224 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (1507305).

Almost surely, 2^10003865 is an apocalyptic number.

10003865 is the 2237-th centered square number.

It is an amenable number.

10003865 is a deficient number, since it is larger than the sum of its proper divisors (2054575).

10003865 is an equidigital number, since it uses as much as digits as its factorization.

10003865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8971.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 10003865 is about 3162.8887112891. Note that the first 3 decimals coincide. The cubic root of 10003865 is about 215.4712217283.

Adding to 10003865 its reverse (56830001), we get a palindrome (66833866).

The spelling of 10003865 in words is "ten million, three thousand, eight hundred sixty-five".