1866685 has 8 divisors (see below), whose sum is σ = 2371896. Its totient is φ = 1405440.

The previous prime is 1866679. The next prime is 1866721. The reversal of 1866685 is 5866681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 636804 + 1229881 = 798^2 + 1109^2 .

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

It is not a de Polignac number, because 1866685 - 2³ = 1866677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10896 + ... + 11065.

It is an arithmetic number, because the mean of its divisors is an integer number (296487).

2^1866685 is an apocalyptic number.

It is an amenable number.

1866685 is a deficient number, since it is larger than the sum of its proper divisors (505211).

1866685 is a wasteful number, since it uses less digits than its factorization.

1866685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21983.

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

The square root of 1866685 is about 1366.2668114245. The cubic root of 1866685 is about 123.1280531250.

The spelling of 1866685 in words is "one million, eight hundred sixty-six thousand, six hundred eighty-five".