3665817 has 20 divisors (see below), whose sum is σ = 5529216. Its totient is φ = 2420280.

The previous prime is 3665813. The next prime is 3665819. The reversal of 3665817 is 7185663.

It is not a de Polignac number, because 3665817 - 2² = 3665813 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

3665817 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3665813) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13392 + ... + 13662.

Almost surely, 2^3665817 is an apocalyptic number.

It is an amenable number.

3665817 is a deficient number, since it is larger than the sum of its proper divisors (1863399).

3665817 is a wasteful number, since it uses less digits than its factorization.

3665817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 441 counting only the distinct ones).

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

The square root of 3665817 is about 1914.6323406858. The cubic root of 3665817 is about 154.1902551034.

The spelling of 3665817 in words is "three million, six hundred sixty-five thousand, eight hundred seventeen".