3631866 has 32 divisors (see below), whose sum is σ = 8498688. Its totient is φ = 1013040.

The previous prime is 3631841. The next prime is 3631871. The reversal of 3631866 is 6681363.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (265584).

Almost surely, 2^3631866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3631866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4249344).

3631866 is an abundant number, since it is smaller than the sum of its proper divisors (4866822).

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

3631866 is a wasteful number, since it uses less digits than its factorization.

3631866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066.

The product of its digits is 15552, while the sum is 33.

The square root of 3631866 is about 1905.7455234107. The cubic root of 3631866 is about 153.7127664482.

The spelling of 3631866 in words is "three million, six hundred thirty-one thousand, eight hundred sixty-six".