3656866 has 4 divisors (see below), whose sum is σ = 5485302. Its totient is φ = 1828432.

The previous prime is 3656857. The next prime is 3656867. The reversal of 3656866 is 6686563.

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

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 1766241 = 1375^2 + 1329^2 .

It is not an unprimeable number, because it can be changed into a prime (3656867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 914215 + ... + 914218.

Almost surely, 2^3656866 is an apocalyptic number.

3656866 is a deficient number, since it is larger than the sum of its proper divisors (1828436).

3656866 is a wasteful number, since it uses less digits than its factorization.

3656866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828435.

The product of its digits is 155520, while the sum is 40.

The square root of 3656866 is about 1912.2933875324. The cubic root of 3656866 is about 154.0646549228.

The spelling of 3656866 in words is "three million, six hundred fifty-six thousand, eight hundred sixty-six".