19478423 has 2 divisors, whose sum is σ = 19478424. Its totient is φ = 19478422.

The previous prime is 19478419. The next prime is 19478443. The reversal of 19478423 is 32487491.

It is a weak prime.

It is an emirp because it is prime and its reverse (32487491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19478423 - 2² = 19478419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19478443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9739211 + 9739212.

It is an arithmetic number, because the mean of its divisors is an integer number (9739212).

Almost surely, 2^19478423 is an apocalyptic number.

19478423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19478423 is an equidigital number, since it uses as much as digits as its factorization.

19478423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 19478423 is about 4413.4366427989. The cubic root of 19478423 is about 269.0613174021.

The spelling of 19478423 in words is "nineteen million, four hundred seventy-eight thousand, four hundred twenty-three".