4002385 has 4 divisors (see below), whose sum is σ = 4802868. Its totient is φ = 3201904.

The previous prime is 4002353. The next prime is 4002389. The reversal of 4002385 is 5832004.

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 452929 + 3549456 = 673^2 + 1884^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002385 - 2⁵ = 4002353 is a prime.

It is a super-4 number, since 4×4002385⁴ (a number of 28 digits) contains 4444 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4002389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400234 + ... + 400243.

It is an arithmetic number, because the mean of its divisors is an integer number (1200717).

Almost surely, 2^4002385 is an apocalyptic number.

It is an amenable number.

4002385 is a deficient number, since it is larger than the sum of its proper divisors (800483).

4002385 is an equidigital number, since it uses as much as digits as its factorization.

4002385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800482.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4002385 is about 2000.5961611480. The cubic root of 4002385 is about 158.7716485243.

Adding to 4002385 its reverse (5832004), we get a palindrome (9834389).

The spelling of 4002385 in words is "four million, two thousand, three hundred eighty-five".