3967881 has 16 divisors (see below), whose sum is σ = 5474304. Its totient is φ = 2555024.

The previous prime is 3967877. The next prime is 3967913. The reversal of 3967881 is 1887693.

3967881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3967881 - 2² = 3967877 is a prime.

It is a super-2 number, since 2×3967881² = 31488159260322, which contains 22 as substring.

3967881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3967801) 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 15 ways as a sum of consecutive naturals, for example, 14956 + ... + 15218.

It is an arithmetic number, because the mean of its divisors is an integer number (342144).

Almost surely, 2^3967881 is an apocalyptic number.

It is an amenable number.

3967881 is a deficient number, since it is larger than the sum of its proper divisors (1506423).

3967881 is a wasteful number, since it uses less digits than its factorization.

3967881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 72576, while the sum is 42.

The square root of 3967881 is about 1991.9540657355. The cubic root of 3967881 is about 158.3140817467.

The spelling of 3967881 in words is "three million, nine hundred sixty-seven thousand, eight hundred eighty-one".