1980866 has 8 divisors (see below), whose sum is σ = 3021840. Its totient is φ = 973588.

The previous prime is 1980863. The next prime is 1980877. The reversal of 1980866 is 6680891.

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

It is not an unprimeable number, because it can be changed into a prime (1980863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8276 + ... + 8511.

It is an arithmetic number, because the mean of its divisors is an integer number (377730).

2^1980866 is an apocalyptic number.

1980866 is a deficient number, since it is larger than the sum of its proper divisors (1040974).

1980866 is a wasteful number, since it uses less digits than its factorization.

1980866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16848.

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

The square root of 1980866 is about 1407.4324140079. The cubic root of 1980866 is about 125.5890280082.

The spelling of 1980866 in words is "one million, nine hundred eighty thousand, eight hundred sixty-six".