4218985 has 4 divisors (see below), whose sum is σ = 5062788. Its totient is φ = 3375184.

The previous prime is 4218979. The next prime is 4218989. The reversal of 4218985 is 5898124.

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 1700416 + 2518569 = 1304^2 + 1587^2 .

It is a cyclic number.

It is not a de Polignac number, because 4218985 - 2⁷ = 4218857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4218989) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 421894 + ... + 421903.

It is an arithmetic number, because the mean of its divisors is an integer number (1265697).

Almost surely, 2^4218985 is an apocalyptic number.

It is an amenable number.

4218985 is a deficient number, since it is larger than the sum of its proper divisors (843803).

4218985 is an equidigital number, since it uses as much as digits as its factorization.

4218985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843802.

The product of its digits is 23040, while the sum is 37.

The square root of 4218985 is about 2054.0167964260. The cubic root of 4218985 is about 161.5856019465.

The spelling of 4218985 in words is "four million, two hundred eighteen thousand, nine hundred eighty-five".