19704823 has 2 divisors, whose sum is σ = 19704824. Its totient is φ = 19704822.

The previous prime is 19704787. The next prime is 19704851. The reversal of 19704823 is 32840791.

It is a strong prime.

It is an emirp because it is prime and its reverse (32840791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19704823 is a prime.

It is a super-2 number, since 2×19704823² = 776560098922658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19704863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9852411 + 9852412.

It is an arithmetic number, because the mean of its divisors is an integer number (9852412).

Almost surely, 2^19704823 is an apocalyptic number.

19704823 is a deficient number, since it is larger than the sum of its proper divisors (1).

19704823 is an equidigital number, since it uses as much as digits as its factorization.

19704823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 19704823 is about 4439.0114890592. The cubic root of 19704823 is about 270.0997482384.

The spelling of 19704823 in words is "nineteen million, seven hundred four thousand, eight hundred twenty-three".