78916843 has 4 divisors (see below), whose sum is σ = 78955240. Its totient is φ = 78878448.

The previous prime is 78916837. The next prime is 78916853. The reversal of 78916843 is 34861987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34861987 = 2543 ⋅13709.

It is a cyclic number.

It is not a de Polignac number, because 78916843 - 2⁵ = 78916811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78916793 and 78916802.

It is not an unprimeable number, because it can be changed into a prime (78916853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15930 + ... + 20287.

It is an arithmetic number, because the mean of its divisors is an integer number (19738810).

Almost surely, 2^78916843 is an apocalyptic number.

78916843 is a deficient number, since it is larger than the sum of its proper divisors (38397).

78916843 is a wasteful number, since it uses less digits than its factorization.

78916843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38396.

The product of its digits is 290304, while the sum is 46.

The square root of 78916843 is about 8883.5152389130. The cubic root of 78916843 is about 428.9334356617.

The spelling of 78916843 in words is "seventy-eight million, nine hundred sixteen thousand, eight hundred forty-three".