1865866 has 8 divisors (see below), whose sum is σ = 2825280. Its totient is φ = 924108.

The previous prime is 1865863. The next prime is 1865881. The reversal of 1865866 is 6685681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1865863) 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, 4146 + ... + 4573.

It is an arithmetic number, because the mean of its divisors is an integer number (353160).

2^1865866 is an apocalyptic number.

1865866 is a deficient number, since it is larger than the sum of its proper divisors (959414).

1865866 is a wasteful number, since it uses less digits than its factorization.

1865866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8828.

The product of its digits is 69120, while the sum is 40.

The square root of 1865866 is about 1365.9670567038. The cubic root of 1865866 is about 123.1100431899.

The spelling of 1865866 in words is "one million, eight hundred sixty-five thousand, eight hundred sixty-six".