4005081 has 12 divisors (see below), whose sum is σ = 6125652. Its totient is φ = 2512896.

The previous prime is 4005049. The next prime is 4005091. The reversal of 4005081 is 1805004.

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 455625 = 1884^2 + 675^2 .

It is not a de Polignac number, because 4005081 - 2⁵ = 4005049 is a prime.

It is a super-2 number, since 2×4005081² = 32081347633122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4005091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12936 + ... + 13241.

It is an arithmetic number, because the mean of its divisors is an integer number (510471).

Almost surely, 2^4005081 is an apocalyptic number.

It is an amenable number.

4005081 is a deficient number, since it is larger than the sum of its proper divisors (2120571).

4005081 is a wasteful number, since it uses less digits than its factorization.

4005081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26200 (or 26197 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 4005081 is about 2001.2698468722. The cubic root of 4005081 is about 158.8072899639.

The spelling of 4005081 in words is "four million, five thousand, eighty-one".