9780019489 has 2 divisors, whose sum is σ = 9780019490. Its totient is φ = 9780019488.

The previous prime is 9780019481. The next prime is 9780019499. The reversal of 9780019489 is 9849100879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7535628864 + 2244390625 = 86808^2 + 47375^2 .

It is an emirp because it is prime and its reverse (9849100879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9780019489 - 2³ = 9780019481 is a prime.

It is a super-2 number, since 2×9780019489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9780019481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4890009744 + 4890009745.

It is an arithmetic number, because the mean of its divisors is an integer number (4890009745).

Almost surely, 2^9780019489 is an apocalyptic number.

It is an amenable number.

9780019489 is a deficient number, since it is larger than the sum of its proper divisors (1).

9780019489 is an equidigital number, since it uses as much as digits as its factorization.

9780019489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 9780019489 is about 98893.9810554717. The cubic root of 9780019489 is about 2138.5196249125.

The spelling of 9780019489 in words is "nine billion, seven hundred eighty million, nineteen thousand, four hundred eighty-nine".