1866706 has 8 divisors (see below), whose sum is σ = 2806524. Its totient is φ = 931200.

The previous prime is 1866679. The next prime is 1866721. The reversal of 1866706 is 6076681.

1866706 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 1863225 + 3481 = 1365^2 + 59^2 .

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 426 + ... + 1978.

2^1866706 is an apocalyptic number.

1866706 is a deficient number, since it is larger than the sum of its proper divisors (939818).

1866706 is a wasteful number, since it uses less digits than its factorization.

1866706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1866706 is about 1366.2744965782. The cubic root of 1866706 is about 123.1285148489.

The spelling of 1866706 in words is "one million, eight hundred sixty-six thousand, seven hundred six".