1866366 has 12 divisors (see below), whose sum is σ = 4043832. Its totient is φ = 622116.

The previous prime is 1866349. The next prime is 1866367. The reversal of 1866366 is 6636681.

1866366 is a `hidden beast` number, since 18 + 6 + 636 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1866366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51826 + ... + 51861.

It is an arithmetic number, because the mean of its divisors is an integer number (336986).

2^1866366 is an apocalyptic number.

1866366 is an abundant number, since it is smaller than the sum of its proper divisors (2177466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866366 is a wasteful number, since it uses less digits than its factorization.

1866366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103695 (or 103692 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1866366 is about 1366.1500649636. The cubic root of 1866366 is about 123.1210388927.

The spelling of 1866366 in words is "one million, eight hundred sixty-six thousand, three hundred sixty-six".