3959861 has 8 divisors (see below), whose sum is σ = 4233240. Its totient is φ = 3691008.

The previous prime is 3959849. The next prime is 3959869. The reversal of 3959861 is 1689593.

It can be written as a sum of positive squares in 4 ways, for example, as 481636 + 3478225 = 694^2 + 1865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3959861 - 2¹⁸ = 3697717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3959869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (529155).

Almost surely, 2^3959861 is an apocalyptic number.

It is an amenable number.

3959861 is a deficient number, since it is larger than the sum of its proper divisors (273379).

3959861 is a wasteful number, since it uses less digits than its factorization.

3959861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its digits is 58320, while the sum is 41.

The square root of 3959861 is about 1989.9399488427. The cubic root of 3959861 is about 158.2073467468.

The spelling of 3959861 in words is "three million, nine hundred fifty-nine thousand, eight hundred sixty-one".