1979779 has 2 divisors, whose sum is σ = 1979780. Its totient is φ = 1979778.

The previous prime is 1979773. The next prime is 1979807. The reversal of 1979779 is 9779791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1979779 - 2¹⁹ = 1455491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1979773) 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 as a sum of consecutive naturals, namely, 989889 + 989890.

It is an arithmetic number, because the mean of its divisors is an integer number (989890).

2^1979779 is an apocalyptic number.

1979779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979779 is an equidigital number, since it uses as much as digits as its factorization.

1979779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250047, while the sum is 49.

The square root of 1979779 is about 1407.0461968251. The cubic root of 1979779 is about 125.5660514832.

The spelling of 1979779 in words is "one million, nine hundred seventy-nine thousand, seven hundred seventy-nine".