3944581 has 2 divisors, whose sum is σ = 3944582. Its totient is φ = 3944580.

The previous prime is 3944557. The next prime is 3944593. The reversal of 3944581 is 1854493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 4356 = 1985^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 3944581 - 2¹⁹ = 3420293 is a prime.

It is a super-2 number, since 2×3944581² = 31119438531122, which contains 22 as substring.

3944581 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3944881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972290 + 1972291.

It is an arithmetic number, because the mean of its divisors is an integer number (1972291).

Almost surely, 2^3944581 is an apocalyptic number.

It is an amenable number.

3944581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3944581 is an equidigital number, since it uses as much as digits as its factorization.

3944581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 3944581 is about 1986.0969261343. The cubic root of 3944581 is about 158.0035917573.

The spelling of 3944581 in words is "three million, nine hundred forty-four thousand, five hundred eighty-one".