3661816 has 32 divisors (see below), whose sum is σ = 7182000. Its totient is φ = 1748736.

The previous prime is 3661781. The next prime is 3661831. The reversal of 3661816 is 6181663.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26275 + ... + 26413.

Almost surely, 2^3661816 is an apocalyptic number.

It is an amenable number.

3661816 is a deficient number, since it is larger than the sum of its proper divisors (3520184).

3661816 is a wasteful number, since it uses less digits than its factorization.

3661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 267 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 3661816 is about 1913.5872073151. The cubic root of 3661816 is about 154.1341384826.

The spelling of 3661816 in words is "three million, six hundred sixty-one thousand, eight hundred sixteen".