4028581 has 4 divisors (see below), whose sum is σ = 4036032. Its totient is φ = 4021132.

The previous prime is 4028573. The next prime is 4028599. The reversal of 4028581 is 1858204.

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 4028581 - 2³ = 4028573 is a prime.

It is a super-2 number, since 2×4028581² = 32458929747122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4028561) 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, 2845 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (1009008).

Almost surely, 2^4028581 is an apocalyptic number.

It is an amenable number.

4028581 is a deficient number, since it is larger than the sum of its proper divisors (7451).

4028581 is an equidigital number, since it uses as much as digits as its factorization.

4028581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 4028581 is about 2007.1325317477. The cubic root of 4028581 is about 159.1172875098.

The spelling of 4028581 in words is "four million, twenty-eight thousand, five hundred eighty-one".