4008981 has 16 divisors (see below), whose sum is σ = 5723840. Its totient is φ = 2488320.

The previous prime is 4008971. The next prime is 4008997. The reversal of 4008981 is 1898004.

It is a happy number.

4008981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4008981 - 2⁷ = 4008853 is a prime.

It is a super-2 number, since 2×4008981² = 32143857316722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4008971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2901 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (357740).

Almost surely, 2^4008981 is an apocalyptic number.

It is an amenable number.

4008981 is a deficient number, since it is larger than the sum of its proper divisors (1714859).

4008981 is a wasteful number, since it uses less digits than its factorization.

4008981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 4008981 is about 2002.2439911260. The cubic root of 4008981 is about 158.8588201333.

The spelling of 4008981 in words is "four million, eight thousand, nine hundred eighty-one".