4002865 has 4 divisors (see below), whose sum is σ = 4803444. Its totient is φ = 3202288.

The previous prime is 4002857. The next prime is 4002877. The reversal of 4002865 is 5682004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 3381921 = 788^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002865 - 2³ = 4002857 is a prime.

It is a Duffinian number.

4002865 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400282 + ... + 400291.

It is an arithmetic number, because the mean of its divisors is an integer number (1200861).

Almost surely, 2^4002865 is an apocalyptic number.

It is an amenable number.

4002865 is a deficient number, since it is larger than the sum of its proper divisors (800579).

4002865 is an equidigital number, since it uses as much as digits as its factorization.

4002865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800578.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 4002865 is about 2000.7161217924. The cubic root of 4002865 is about 158.7779953521. Note that the first 3 decimals are identical.

Adding to 4002865 its reverse (5682004), we get a palindrome (9684869).

The spelling of 4002865 in words is "four million, two thousand, eight hundred sixty-five".