1980779 has 4 divisors (see below), whose sum is σ = 1989240. Its totient is φ = 1972320.

The previous prime is 1980773. The next prime is 1980791. The reversal of 1980779 is 9770891.

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

It is a cyclic number.

It is not a de Polignac number, because 1980779 - 2⁴ = 1980763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980773) 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 3 ways as a sum of consecutive naturals, for example, 3869 + ... + 4350.

It is an arithmetic number, because the mean of its divisors is an integer number (497310).

2^1980779 is an apocalyptic number.

1980779 is a deficient number, since it is larger than the sum of its proper divisors (8461).

1980779 is an equidigital number, since it uses as much as digits as its factorization.

1980779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8460.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 1980779 is about 1407.4015063229. The cubic root of 1980779 is about 125.5871893502.

The spelling of 1980779 in words is "one million, nine hundred eighty thousand, seven hundred seventy-nine".