19933439 has 2 divisors, whose sum is σ = 19933440. Its totient is φ = 19933438.

The previous prime is 19933429. The next prime is 19933447. The reversal of 19933439 is 93433991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19933439 - 2⁸ = 19933183 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19933396 and 19933405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19933409) 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, 9966719 + 9966720.

It is an arithmetic number, because the mean of its divisors is an integer number (9966720).

Almost surely, 2^19933439 is an apocalyptic number.

19933439 is a deficient number, since it is larger than the sum of its proper divisors (1).

19933439 is an equidigital number, since it uses as much as digits as its factorization.

19933439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 41.

The square root of 19933439 is about 4464.6880070168. The cubic root of 19933439 is about 271.1403030704.

The spelling of 19933439 in words is "nineteen million, nine hundred thirty-three thousand, four hundred thirty-nine".