78138323 has 2 divisors, whose sum is σ = 78138324. Its totient is φ = 78138322.

The previous prime is 78138311. The next prime is 78138329. The reversal of 78138323 is 32383187.

It is a strong prime.

It is an emirp because it is prime and its reverse (32383187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78138323 is a prime.

It is a super-2 number, since 2×78138323² = 12211195042504658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78138329) 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, 39069161 + 39069162.

It is an arithmetic number, because the mean of its divisors is an integer number (39069162).

Almost surely, 2^78138323 is an apocalyptic number.

78138323 is a deficient number, since it is larger than the sum of its proper divisors (1).

78138323 is an equidigital number, since it uses as much as digits as its factorization.

78138323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 35.

The square root of 78138323 is about 8839.5883953949. The cubic root of 78138323 is about 427.5182860981.

The spelling of 78138323 in words is "seventy-eight million, one hundred thirty-eight thousand, three hundred twenty-three".