1866664 has 16 divisors (see below), whose sum is σ = 3515220. Its totient is φ = 929280.

The previous prime is 1866659. The next prime is 1866677. The reversal of 1866664 is 4666681.

It can be written as a sum of positive squares in 2 ways, for example, as 1844164 + 22500 = 1358^2 + 150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2494 + ... + 3154.

2^1866664 is an apocalyptic number.

It is an amenable number.

1866664 is a deficient number, since it is larger than the sum of its proper divisors (1648556).

1866664 is a wasteful number, since it uses less digits than its factorization.

1866664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1016 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 1866664 is about 1366.2591262275. The cubic root of 1866664 is about 123.1275913976.

The spelling of 1866664 in words is "one million, eight hundred sixty-six thousand, six hundred sixty-four".