3937581 has 6 divisors (see below), whose sum is σ = 5687630. Its totient is φ = 2625048.

The previous prime is 3937573. The next prime is 3937607. The reversal of 3937581 is 1857393.

3937581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3481956 + 455625 = 1866^2 + 675^2 .

It is not a de Polignac number, because 3937581 - 2³ = 3937573 is a prime.

It is a super-2 number, since 2×3937581² = 31009088263122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3937501) 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 5 ways as a sum of consecutive naturals, for example, 218746 + ... + 218763.

Almost surely, 2^3937581 is an apocalyptic number.

It is an amenable number.

3937581 is a deficient number, since it is larger than the sum of its proper divisors (1750049).

3937581 is a wasteful number, since it uses less digits than its factorization.

3937581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437515 (or 437512 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3937581 is about 1984.3338932750. Note that the first 3 decimals coincide. The cubic root of 3937581 is about 157.9100727385.

The spelling of 3937581 in words is "three million, nine hundred thirty-seven thousand, five hundred eighty-one".