4002665 has 4 divisors (see below), whose sum is σ = 4803204. Its totient is φ = 3202128.

The previous prime is 4002643. The next prime is 4002671. The reversal of 4002665 is 5662004.

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 456976 + 3545689 = 676^2 + 1883^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002665 - 2²⁰ = 2954089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4002665.

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, 400262 + ... + 400271.

It is an arithmetic number, because the mean of its divisors is an integer number (1200801).

Almost surely, 2^4002665 is an apocalyptic number.

It is an amenable number.

4002665 is a deficient number, since it is larger than the sum of its proper divisors (800539).

4002665 is an equidigital number, since it uses as much as digits as its factorization.

4002665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800538.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 4002665 is about 2000.6661390647. Note that the first 3 decimals coincide. The cubic root of 4002665 is about 158.7753509022.

Adding to 4002665 its reverse (5662004), we get a palindrome (9664669).

The spelling of 4002665 in words is "four million, two thousand, six hundred sixty-five".