3691566 has 24 divisors (see below), whose sum is σ = 8120424. Its totient is φ = 1211760.

The previous prime is 3691561. The next prime is 3691577. The reversal of 3691566 is 6651963.

3691566 is a `hidden beast` number, since 3 + 6 + 91 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3691566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325 + ... + 2736.

It is an arithmetic number, because the mean of its divisors is an integer number (338351).

Almost surely, 2^3691566 is an apocalyptic number.

3691566 is an abundant number, since it is smaller than the sum of its proper divisors (4428858).

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

3691566 is a wasteful number, since it uses less digits than its factorization.

3691566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136 (or 3133 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 3691566 is about 1921.3448415108. The cubic root of 3691566 is about 154.5504281298.

The spelling of 3691566 in words is "three million, six hundred ninety-one thousand, five hundred sixty-six".