1856866 has 12 divisors (see below), whose sum is σ = 3061926. Its totient is φ = 843920.

The previous prime is 1856861. The next prime is 1856891. The reversal of 1856866 is 6686581.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1490841 + 366025 = 1221^2 + 605^2 .

It is not an unprimeable number, because it can be changed into a prime (1856861) 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, 3595 + ... + 4078.

2^1856866 is an apocalyptic number.

1856866 is a deficient number, since it is larger than the sum of its proper divisors (1205060).

1856866 is a wasteful number, since it uses less digits than its factorization.

1856866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7697 (or 7686 counting only the distinct ones).

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

The square root of 1856866 is about 1362.6687051518. The cubic root of 1856866 is about 122.9117837506.

The spelling of 1856866 in words is "one million, eight hundred fifty-six thousand, eight hundred sixty-six".