1980806 has 24 divisors (see below), whose sum is σ = 3315600. Its totient is φ = 885632.

The previous prime is 1980791. The next prime is 1980809. The reversal of 1980806 is 6080891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980809) 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 11 ways as a sum of consecutive naturals, for example, 13220 + ... + 13368.

It is an arithmetic number, because the mean of its divisors is an integer number (138150).

2^1980806 is an apocalyptic number.

1980806 is a deficient number, since it is larger than the sum of its proper divisors (1334794).

1980806 is a wasteful number, since it uses less digits than its factorization.

1980806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1980806 is about 1407.4110984357. The cubic root of 1980806 is about 125.5877599740.

The spelling of 1980806 in words is "one million, nine hundred eighty thousand, eight hundred six".