3966181 has 4 divisors (see below), whose sum is σ = 3972672. Its totient is φ = 3959692.

The previous prime is 3966173. The next prime is 3966197. The reversal of 3966181 is 1816693.

3966181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1816693 = 31 ⋅58603.

It is a cyclic number.

It is not a de Polignac number, because 3966181 - 2³ = 3966173 is a prime.

It is a super-2 number, since 2×3966181² = 31461183449522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

3966181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966121) 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 3 ways as a sum of consecutive naturals, for example, 2221 + ... + 3586.

It is an arithmetic number, because the mean of its divisors is an integer number (993168).

Almost surely, 2^3966181 is an apocalyptic number.

It is an amenable number.

3966181 is a deficient number, since it is larger than the sum of its proper divisors (6491).

3966181 is an equidigital number, since it uses as much as digits as its factorization.

3966181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490.

The product of its digits is 7776, while the sum is 34.

The square root of 3966181 is about 1991.5273033529. The cubic root of 3966181 is about 158.2914691412.

The spelling of 3966181 in words is "three million, nine hundred sixty-six thousand, one hundred eighty-one".