1866856 has 8 divisors (see below), whose sum is σ = 3500370. Its totient is φ = 933424.

The previous prime is 1866847. The next prime is 1866857. The reversal of 1866856 is 6586681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 900 = 1366^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1866857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116671 + ... + 116686.

2^1866856 is an apocalyptic number.

It is an amenable number.

1866856 is a deficient number, since it is larger than the sum of its proper divisors (1633514).

1866856 is a wasteful number, since it uses less digits than its factorization.

1866856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233363 (or 233359 counting only the distinct ones).

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

The square root of 1866856 is about 1366.3293892762. The cubic root of 1866856 is about 123.1318127763.

The spelling of 1866856 in words is "one million, eight hundred sixty-six thousand, eight hundred fifty-six".