3781666 has 16 divisors (see below), whose sum is σ = 6511104. Its totient is φ = 1613664.

The previous prime is 3781663. The next prime is 3781669. The reversal of 3781666 is 6661873.

It is an interprime number because it is at equal distance from previous prime (3781663) and next prime (3781669).

It is not an unprimeable number, because it can be changed into a prime (3781663) 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, 3951 + ... + 4813.

It is an arithmetic number, because the mean of its divisors is an integer number (406944).

Almost surely, 2^3781666 is an apocalyptic number.

3781666 is a deficient number, since it is larger than the sum of its proper divisors (2729438).

3781666 is a wasteful number, since it uses less digits than its factorization.

3781666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185.

The product of its digits is 36288, while the sum is 37.

The square root of 3781666 is about 1944.6506112924. The cubic root of 3781666 is about 155.7977051311.

The spelling of 3781666 in words is "three million, seven hundred eighty-one thousand, six hundred sixty-six".