4026581 has 4 divisors (see below), whose sum is σ = 4336332. Its totient is φ = 3716832.

The previous prime is 4026571. The next prime is 4026593. The reversal of 4026581 is 1856204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286225 + 3740356 = 535^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 4026581 - 2¹⁸ = 3764437 is a prime.

It is a super-2 number, since 2×4026581² = 32426709099122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4026581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4026511) 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, 154856 + ... + 154881.

It is an arithmetic number, because the mean of its divisors is an integer number (1084083).

Almost surely, 2^4026581 is an apocalyptic number.

It is an amenable number.

4026581 is a deficient number, since it is larger than the sum of its proper divisors (309751).

4026581 is a wasteful number, since it uses less digits than its factorization.

4026581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309750.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 4026581 is about 2006.6342466927. The cubic root of 4026581 is about 159.0909517477.

The spelling of 4026581 in words is "four million, twenty-six thousand, five hundred eighty-one".