4143985 has 4 divisors (see below), whose sum is σ = 4972788. Its totient is φ = 3315184.

The previous prime is 4143973. The next prime is 4144001. The reversal of 4143985 is 5893414.

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 484416 + 3659569 = 696^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 4143985 - 2⁷ = 4143857 is a prime.

It is a super-2 number, since 2×4143985² = 34345223360450, which contains 22 as substring.

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 4143985.

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, 414394 + ... + 414403.

It is an arithmetic number, because the mean of its divisors is an integer number (1243197).

Almost surely, 2^4143985 is an apocalyptic number.

It is an amenable number.

4143985 is a deficient number, since it is larger than the sum of its proper divisors (828803).

4143985 is an equidigital number, since it uses as much as digits as its factorization.

4143985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828802.

The product of its digits is 17280, while the sum is 34.

The square root of 4143985 is about 2035.6780197271. The cubic root of 4143985 is about 160.6223805636.

The spelling of 4143985 in words is "four million, one hundred forty-three thousand, nine hundred eighty-five".