4081985 has 8 divisors (see below), whose sum is σ = 4953960. Its totient is φ = 3228544.

The previous prime is 4081969. The next prime is 4081991. The reversal of 4081985 is 5891804.

It can be written as a sum of positive squares in 4 ways, for example, as 97969 + 3984016 = 313^2 + 1996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4081985 - 2⁴ = 4081969 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4142 + ... + 5031.

It is an arithmetic number, because the mean of its divisors is an integer number (619245).

Almost surely, 2^4081985 is an apocalyptic number.

It is an amenable number.

4081985 is a deficient number, since it is larger than the sum of its proper divisors (871975).

4081985 is an equidigital number, since it uses as much as digits as its factorization.

4081985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9267.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 4081985 is about 2020.3922886410. The cubic root of 4081985 is about 159.8173044899.

It can be divided in two parts, 40819 and 85, that added together give a palindrome (40904).

The spelling of 4081985 in words is "four million, eighty-one thousand, nine hundred eighty-five".