10001865 has 32 divisors (see below), whose sum is σ = 17248896. Its totient is φ = 4930560.

The previous prime is 10001861. The next prime is 10001881. The reversal of 10001865 is 56810001.

10001865 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10001865 - 2² = 10001861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10001861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15234 + ... + 15876.

It is an arithmetic number, because the mean of its divisors is an integer number (539028).

Almost surely, 2^10001865 is an apocalyptic number.

10001865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10001865 is a deficient number, since it is larger than the sum of its proper divisors (7247031).

10001865 is a wasteful number, since it uses less digits than its factorization.

10001865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 10001865 is about 3162.5725288126. The cubic root of 10001865 is about 215.4568615730.

Adding to 10001865 its reverse (56810001), we get a palindrome (66811866).

The spelling of 10001865 in words is "ten million, one thousand, eight hundred sixty-five".