19439089 has 2 divisors, whose sum is σ = 19439090. Its totient is φ = 19439088.

The previous prime is 19439083. The next prime is 19439099. The reversal of 19439089 is 98093491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 9199089 = 3200^2 + 3033^2 .

It is an emirp because it is prime and its reverse (98093491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19439089 - 2¹³ = 19430897 is a prime.

It is a super-2 number, since 2×19439089² = 755756362299842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19439083) 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 as a sum of consecutive naturals, namely, 9719544 + 9719545.

It is an arithmetic number, because the mean of its divisors is an integer number (9719545).

Almost surely, 2^19439089 is an apocalyptic number.

It is an amenable number.

19439089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19439089 is an equidigital number, since it uses as much as digits as its factorization.

19439089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19439089 is about 4408.9782263014. The cubic root of 19439089 is about 268.8800845635.

The spelling of 19439089 in words is "nineteen million, four hundred thirty-nine thousand, eighty-nine".