3781566 has 48 divisors (see below), whose sum is σ = 8805888. Its totient is φ = 1215000.

The previous prime is 3781559. The next prime is 3781567. The reversal of 3781566 is 6651873.

It is a self number, because there is not a number n which added to its sum of digits gives 3781566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14941 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

Almost surely, 2^3781566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3781566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4402944).

3781566 is an abundant number, since it is smaller than the sum of its proper divisors (5024322).

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

3781566 is a wasteful number, since it uses less digits than its factorization.

3781566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 287 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 3781566 is about 1944.6248995629. The cubic root of 3781566 is about 155.7963318468.

The spelling of 3781566 in words is "three million, seven hundred eighty-one thousand, five hundred sixty-six".