1989779359 has 2 divisors, whose sum is σ = 1989779360. Its totient is φ = 1989779358.

The previous prime is 1989779329. The next prime is 1989779401. The reversal of 1989779359 is 9539779891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1989779359 - 2²⁵ = 1956224927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1989779294 and 1989779303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989779329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994889679 + 994889680.

It is an arithmetic number, because the mean of its divisors is an integer number (994889680).

Almost surely, 2^1989779359 is an apocalyptic number.

1989779359 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989779359 is an equidigital number, since it uses as much as digits as its factorization.

1989779359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38578680, while the sum is 67.

The square root of 1989779359 is about 44606.9429461379. The cubic root of 1989779359 is about 1257.7711834333.

The spelling of 1989779359 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-nine thousand, three hundred fifty-nine".