3959881 has 4 divisors (see below), whose sum is σ = 3964032. Its totient is φ = 3955732.

The previous prime is 3959873. The next prime is 3959899. The reversal of 3959881 is 1889593.

3959881 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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1889593 = 59 ⋅32027.

It is a cyclic number.

It is not a de Polignac number, because 3959881 - 2³ = 3959873 is a prime.

It is a super-2 number, since 2×3959881² = 31361315068322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (3959801) 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, 156 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (991008).

Almost surely, 2^3959881 is an apocalyptic number.

It is an amenable number.

3959881 is a deficient number, since it is larger than the sum of its proper divisors (4151).

3959881 is a wasteful number, since it uses less digits than its factorization.

3959881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150.

The product of its digits is 77760, while the sum is 43.

The square root of 3959881 is about 1989.9449741136. The cubic root of 3959881 is about 158.2076130980.

The spelling of 3959881 in words is "three million, nine hundred fifty-nine thousand, eight hundred eighty-one".