78422423 has 2 divisors, whose sum is σ = 78422424. Its totient is φ = 78422422.

The previous prime is 78422419. The next prime is 78422437. The reversal of 78422423 is 32422487.

It is a weak prime.

It is an emirp because it is prime and its reverse (32422487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78422423 - 2² = 78422419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78422423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78422453) 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, 39211211 + 39211212.

It is an arithmetic number, because the mean of its divisors is an integer number (39211212).

Almost surely, 2^78422423 is an apocalyptic number.

78422423 is a deficient number, since it is larger than the sum of its proper divisors (1).

78422423 is an equidigital number, since it uses as much as digits as its factorization.

78422423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 32.

The square root of 78422423 is about 8855.6435678047. The cubic root of 78422423 is about 428.0357916177.

The spelling of 78422423 in words is "seventy-eight million, four hundred twenty-two thousand, four hundred twenty-three".