3961866 has 16 divisors (see below), whose sum is σ = 7952544. Its totient is φ = 1315824.

The previous prime is 3961847. The next prime is 3961877. The reversal of 3961866 is 6681693.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (497034).

Almost surely, 2^3961866 is an apocalyptic number.

3961866 is an abundant number, since it is smaller than the sum of its proper divisors (3990678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3961866 is a wasteful number, since it uses less digits than its factorization.

3961866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405.

The product of its digits is 46656, while the sum is 39.

The square root of 3961866 is about 1990.4436691351. The cubic root of 3961866 is about 158.2340439977.

The spelling of 3961866 in words is "three million, nine hundred sixty-one thousand, eight hundred sixty-six".