2102865 has 8 divisors (see below), whose sum is σ = 3364608. Its totient is φ = 1121520.

The previous prime is 2102857. The next prime is 2102873. The reversal of 2102865 is 5682012.

It is an interprime number because it is at equal distance from previous prime (2102857) and next prime (2102873).

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

It is not a de Polignac number, because 2102865 - 2³ = 2102857 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

2102865 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70081 + ... + 70110.

It is an arithmetic number, because the mean of its divisors is an integer number (420576).

2^2102865 is an apocalyptic number.

It is an amenable number.

2102865 is a deficient number, since it is larger than the sum of its proper divisors (1261743).

2102865 is a wasteful number, since it uses less digits than its factorization.

2102865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140199.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2102865 is about 1450.1258566069. The cubic root of 2102865 is about 128.1161258974.

Adding to 2102865 its reverse (5682012), we get a palindrome (7784877).

The spelling of 2102865 in words is "two million, one hundred two thousand, eight hundred sixty-five".