19394489 has 2 divisors, whose sum is σ = 19394490.
Its totient is φ = 19394488.
The previous prime is 19394477. The next prime is 19394509. The reversal of 19394489 is 98449391.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 17935225 + 1459264 = 4235^2 + 1208^2
It is a cyclic number.
It is not a de Polignac number, because 19394489 - 28 = 19394233 is a prime.
It is a super-2 number, since 2×193944892 = 752292407142242, which contains 22 as substring.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (19394429) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9697244 + 9697245.
It is an arithmetic number, because the mean of its divisors is an integer number (9697245).
Almost surely, 219394489 is an apocalyptic number.
It is an amenable number.
19394489 is a deficient number, since it is larger than the sum of its proper divisors (1).
19394489 is an equidigital number, since it uses as much as digits as its factorization.
19394489 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 279936, while the sum is 47.
The square root of 19394489 is about 4403.9174606253.
The cubic root of 19394489 is about 268.6742924302.
The spelling of 19394489 in words is "nineteen million, three hundred ninety-four thousand, four hundred eighty-nine".