1980785 has 4 divisors (see below), whose sum is σ = 2376948. Its totient is φ = 1584624.

The previous prime is 1980773. The next prime is 1980791. The reversal of 1980785 is 5870891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1263376 + 717409 = 1124^2 + 847^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980785 - 2⁸ = 1980529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198074 + ... + 198083.

It is an arithmetic number, because the mean of its divisors is an integer number (594237).

2^1980785 is an apocalyptic number.

It is an amenable number.

1980785 is a deficient number, since it is larger than the sum of its proper divisors (396163).

1980785 is an equidigital number, since it uses as much as digits as its factorization.

1980785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396162.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1980785 is about 1407.4036379092. The cubic root of 1980785 is about 125.5873161560.

The spelling of 1980785 in words is "one million, nine hundred eighty thousand, seven hundred eighty-five".