78819943 has 2 divisors, whose sum is σ = 78819944. Its totient is φ = 78819942.

The previous prime is 78819911. The next prime is 78819977. The reversal of 78819943 is 34991887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78819943 - 2⁵ = 78819911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78819743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39409971 + 39409972.

It is an arithmetic number, because the mean of its divisors is an integer number (39409972).

Almost surely, 2^78819943 is an apocalyptic number.

78819943 is a deficient number, since it is larger than the sum of its proper divisors (1).

78819943 is an equidigital number, since it uses as much as digits as its factorization.

78819943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 78819943 is about 8878.0596416109. The cubic root of 78819943 is about 428.7578049108.

The spelling of 78819943 in words is "seventy-eight million, eight hundred nineteen thousand, nine hundred forty-three".