1986671 has 8 divisors (see below), whose sum is σ = 2195424. Its totient is φ = 1788160.

The previous prime is 1986631. The next prime is 1986679. The reversal of 1986671 is 1766891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150 + ... + 2931.

It is an arithmetic number, because the mean of its divisors is an integer number (274428).

2^1986671 is an apocalyptic number.

1986671 is a deficient number, since it is larger than the sum of its proper divisors (208753).

1986671 is a wasteful number, since it uses less digits than its factorization.

1986671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121.

The product of its digits is 18144, while the sum is 38.

The square root of 1986671 is about 1409.4931713208. The cubic root of 1986671 is about 125.7115894370.

The spelling of 1986671 in words is "one million, nine hundred eighty-six thousand, six hundred seventy-one".