1866845 has 16 divisors (see below), whose sum is σ = 2418240. Its totient is φ = 1378944.

The previous prime is 1866833. The next prime is 1866847. The reversal of 1866845 is 5486681.

It is not a de Polignac number, because 1866845 - 2¹⁰ = 1865821 is a prime.

It is a super-2 number, since 2×1866845² = 6970220508050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1866799 and 1866808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3857 + ... + 4313.

It is an arithmetic number, because the mean of its divisors is an integer number (151140).

2^1866845 is an apocalyptic number.

It is an amenable number.

1866845 is a deficient number, since it is larger than the sum of its proper divisors (551395).

1866845 is a wasteful number, since it uses less digits than its factorization.

1866845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 46080, while the sum is 38.

The square root of 1866845 is about 1366.3253638867. The cubic root of 1866845 is about 123.1315709343.

The spelling of 1866845 in words is "one million, eight hundred sixty-six thousand, eight hundred forty-five".