19404493 has 2 divisors, whose sum is σ = 19404494. Its totient is φ = 19404492.

The previous prime is 19404449. The next prime is 19404499. The reversal of 19404493 is 39440491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 2082249 = 4162^2 + 1443^2 .

It is a cyclic number.

It is not a de Polignac number, because 19404493 - 2⁹ = 19403981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19404499) 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, 9702246 + 9702247.

It is an arithmetic number, because the mean of its divisors is an integer number (9702247).

Almost surely, 2^19404493 is an apocalyptic number.

It is an amenable number.

19404493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19404493 is an equidigital number, since it uses as much as digits as its factorization.

19404493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 19404493 is about 4405.0531211326. The cubic root of 19404493 is about 268.7204800459.

The spelling of 19404493 in words is "nineteen million, four hundred four thousand, four hundred ninety-three".