78839219 has 2 divisors, whose sum is σ = 78839220. Its totient is φ = 78839218.

The previous prime is 78839213. The next prime is 78839237. The reversal of 78839219 is 91293887.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78839219 is a prime.

It is a super-2 number, since 2×78839219² = 12431244905059922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78839213) 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, 39419609 + 39419610.

It is an arithmetic number, because the mean of its divisors is an integer number (39419610).

Almost surely, 2^78839219 is an apocalyptic number.

78839219 is a deficient number, since it is larger than the sum of its proper divisors (1).

78839219 is an equidigital number, since it uses as much as digits as its factorization.

78839219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 78839219 is about 8879.1451728193. The cubic root of 78839219 is about 428.7927540260.

The spelling of 78839219 in words is "seventy-eight million, eight hundred thirty-nine thousand, two hundred nineteen".