3939861 has 16 divisors (see below), whose sum is σ = 5443200. Its totient is φ = 2533440.

The previous prime is 3939851. The next prime is 3939899. The reversal of 3939861 is 1689393.

3939861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3939861 - 2⁵ = 3939829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939811) 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, 11115 + ... + 11463.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

Almost surely, 2^3939861 is an apocalyptic number.

It is an amenable number.

3939861 is a deficient number, since it is larger than the sum of its proper divisors (1503339).

3939861 is a wasteful number, since it uses less digits than its factorization.

3939861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its digits is 34992, while the sum is 39.

The square root of 3939861 is about 1984.9083102249. The cubic root of 3939861 is about 157.9405453812.

The spelling of 3939861 in words is "three million, nine hundred thirty-nine thousand, eight hundred sixty-one".