1328736989 has 2 divisors, whose sum is σ = 1328736990. Its totient is φ = 1328736988.

The previous prime is 1328736971. The next prime is 1328737027. The reversal of 1328736989 is 9896378231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 955860889 + 372876100 = 30917^2 + 19310^2 .

It is an emirp because it is prime and its reverse (9896378231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328736989 is a prime.

It is a super-2 number, since 2×1328736989² = 3531083971873572242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328736919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664368494 + 664368495.

It is an arithmetic number, because the mean of its divisors is an integer number (664368495).

Almost surely, 2^1328736989 is an apocalyptic number.

It is an amenable number.

1328736989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328736989 is an equidigital number, since it uses as much as digits as its factorization.

1328736989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 1328736989 is about 36451.8447955656. The cubic root of 1328736989 is about 1099.3762273383.

The spelling of 1328736989 in words is "one billion, three hundred twenty-eight million, seven hundred thirty-six thousand, nine hundred eighty-nine".