1980845 has 16 divisors (see below), whose sum is σ = 2592000. Its totient is φ = 1447488.

The previous prime is 1980821. The next prime is 1980859. The reversal of 1980845 is 5480891.

It is a cyclic number.

It is not a de Polignac number, because 1980845 - 2¹² = 1976749 is a prime.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 2396 + ... + 3114.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2^1980845 is an apocalyptic number.

It is an amenable number.

1980845 is a deficient number, since it is larger than the sum of its proper divisors (611155).

1980845 is a wasteful number, since it uses less digits than its factorization.

1980845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1980845 is about 1407.4249535943. The cubic root of 1980845 is about 125.5885841992.

The spelling of 1980845 in words is "one million, nine hundred eighty thousand, eight hundred forty-five".