3666687 has 4 divisors (see below), whose sum is σ = 4888920. Its totient is φ = 2444456.

The previous prime is 3666661. The next prime is 3666703. The reversal of 3666687 is 7866663.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3666687 - 2¹² = 3662591 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611112 + ... + 611117.

It is an arithmetic number, because the mean of its divisors is an integer number (1222230).

Almost surely, 2^3666687 is an apocalyptic number.

3666687 is a deficient number, since it is larger than the sum of its proper divisors (1222233).

3666687 is a wasteful number, since it uses less digits than its factorization.

3666687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222232.

The product of its digits is 217728, while the sum is 42.

The square root of 3666687 is about 1914.8595248738. The cubic root of 3666687 is about 154.2024520126.

It can be divided in two parts, 366 and 6687, that multiplied together give a palindrome (2447442).

The spelling of 3666687 in words is "three million, six hundred sixty-six thousand, six hundred eighty-seven".