1980756 has 18 divisors (see below), whose sum is σ = 5007002. Its totient is φ = 660240.

The previous prime is 1980749. The next prime is 1980757. The reversal of 1980756 is 6570891.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 467856 = 1230^2 + 684^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 55021 = 1980756 / (1 + 9 + 8 + 0 + 7 + 5 + 6).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1980756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980757) 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 5 ways as a sum of consecutive naturals, for example, 27475 + ... + 27546.

2^1980756 is an apocalyptic number.

It is an amenable number.

1980756 is an abundant number, since it is smaller than the sum of its proper divisors (3026246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1980756 is a wasteful number, since it uses less digits than its factorization.

1980756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55031 (or 55026 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1980756 is about 1407.3933352123. The cubic root of 1980756 is about 125.5867032592.

The spelling of 1980756 in words is "one million, nine hundred eighty thousand, seven hundred fifty-six".