4005481 has 4 divisors (see below), whose sum is σ = 4090752. Its totient is φ = 3920212.

The previous prime is 4005467. The next prime is 4005499. The reversal of 4005481 is 1845004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4005481 - 2¹⁹ = 3481193 is a prime.

It is a super-2 number, since 2×4005481² = 32087756082722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4006481) 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 3 ways as a sum of consecutive naturals, for example, 42565 + ... + 42658.

It is an arithmetic number, because the mean of its divisors is an integer number (1022688).

Almost surely, 2^4005481 is an apocalyptic number.

It is an amenable number.

4005481 is a deficient number, since it is larger than the sum of its proper divisors (85271).

4005481 is an equidigital number, since it uses as much as digits as its factorization.

4005481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85270.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 4005481 is about 2001.3697809251. The cubic root of 4005481 is about 158.8125766486.

The spelling of 4005481 in words is "four million, five thousand, four hundred eighty-one".