1986806 has 8 divisors (see below), whose sum is σ = 2986200. Its totient is φ = 991408.

The previous prime is 1986797. The next prime is 1986823. The reversal of 1986806 is 6086891.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1986806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370 + ... + 2418.

It is an arithmetic number, because the mean of its divisors is an integer number (373275).

2^1986806 is an apocalyptic number.

1986806 is a deficient number, since it is larger than the sum of its proper divisors (999394).

1986806 is a wasteful number, since it uses less digits than its factorization.

1986806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1986806 is about 1409.5410600617. The cubic root of 1986806 is about 125.7144368603.

The spelling of 1986806 in words is "one million, nine hundred eighty-six thousand, eight hundred six".