9919423 has 2 divisors, whose sum is σ = 9919424. Its totient is φ = 9919422.

The previous prime is 9919409. The next prime is 9919439. The reversal of 9919423 is 3249199.

It is a weak prime.

It is an emirp because it is prime and its reverse (3249199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9919423 - 2⁵ = 9919391 is a prime.

It is equal to p₆₅₉₆₃₈ and since 9919423 and 659638 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9919223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959711 + 4959712.

It is an arithmetic number, because the mean of its divisors is an integer number (4959712).

Almost surely, 2^9919423 is an apocalyptic number.

9919423 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919423 is an equidigital number, since it uses as much as digits as its factorization.

9919423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 9919423 is about 3149.5115494311. The cubic root of 9919423 is about 214.8632481729.

The spelling of 9919423 in words is "nine million, nine hundred nineteen thousand, four hundred twenty-three".