3688666 has 4 divisors (see below), whose sum is σ = 5533002. Its totient is φ = 1844332.

The previous prime is 3688661. The next prime is 3688667. The reversal of 3688666 is 6668863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6668863 = 431 ⋅15473.

It can be written as a sum of positive squares in only one way, i.e., 1879641 + 1809025 = 1371^2 + 1345^2 .

It is not an unprimeable number, because it can be changed into a prime (3688661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 922165 + ... + 922168.

Almost surely, 2^3688666 is an apocalyptic number.

3688666 is a deficient number, since it is larger than the sum of its proper divisors (1844336).

3688666 is a wasteful number, since it uses less digits than its factorization.

3688666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844335.

The product of its digits is 248832, while the sum is 43.

The square root of 3688666 is about 1920.5900135115. The cubic root of 3688666 is about 154.5099472375.

The spelling of 3688666 in words is "three million, six hundred eighty-eight thousand, six hundred sixty-six".