19419989 has 2 divisors, whose sum is σ = 19419990. Its totient is φ = 19419988.

The previous prime is 19419973. The next prime is 19419997. The reversal of 19419989 is 98991491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 3179089 = 4030^2 + 1783^2 .

It is a cyclic number.

It is not a de Polignac number, because 19419989 - 2⁴ = 19419973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19419689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9709994 + 9709995.

It is an arithmetic number, because the mean of its divisors is an integer number (9709995).

Almost surely, 2^19419989 is an apocalyptic number.

It is an amenable number.

19419989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19419989 is an equidigital number, since it uses as much as digits as its factorization.

19419989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 50.

The square root of 19419989 is about 4406.8116592385. The cubic root of 19419989 is about 268.7919924287.

The spelling of 19419989 in words is "nineteen million, four hundred nineteen thousand, nine hundred eighty-nine".