19426439 has 2 divisors, whose sum is σ = 19426440. Its totient is φ = 19426438.

The previous prime is 19426423. The next prime is 19426447. The reversal of 19426439 is 93462491.

It is a strong prime.

It is an emirp because it is prime and its reverse (93462491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19426439 - 2⁴ = 19426423 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 (19426409) 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, 9713219 + 9713220.

It is an arithmetic number, because the mean of its divisors is an integer number (9713220).

Almost surely, 2^19426439 is an apocalyptic number.

19426439 is a deficient number, since it is larger than the sum of its proper divisors (1).

19426439 is an equidigital number, since it uses as much as digits as its factorization.

19426439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 19426439 is about 4407.5434200924. The cubic root of 19426439 is about 268.8217472765.

The spelling of 19426439 in words is "nineteen million, four hundred twenty-six thousand, four hundred thirty-nine".