1980765 has 12 divisors (see below), whose sum is σ = 3433404. Its totient is φ = 1056384.

The previous prime is 1980763. The next prime is 1980773. The reversal of 1980765 is 5670891.

It can be written as a sum of positive squares in 2 ways, for example, as 1159929 + 820836 = 1077^2 + 906^2 .

It is not a de Polignac number, because 1980765 - 2¹ = 1980763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980761) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 21964 + ... + 22053.

It is an arithmetic number, because the mean of its divisors is an integer number (286117).

2^1980765 is an apocalyptic number.

1980765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1980765 is a deficient number, since it is larger than the sum of its proper divisors (1452639).

1980765 is a wasteful number, since it uses less digits than its factorization.

1980765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44028 (or 44025 counting only the distinct ones).

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

The square root of 1980765 is about 1407.3965326091. The cubic root of 1980765 is about 125.5868934692.

The spelling of 1980765 in words is "one million, nine hundred eighty thousand, seven hundred sixty-five".