78943853 has 2 divisors, whose sum is σ = 78943854. Its totient is φ = 78943852.

The previous prime is 78943849. The next prime is 78943867. The reversal of 78943853 is 35834987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60264169 + 18679684 = 7763^2 + 4322^2 .

It is a cyclic number.

It is not a de Polignac number, because 78943853 - 2² = 78943849 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78943798 and 78943807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71943853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39471926 + 39471927.

It is an arithmetic number, because the mean of its divisors is an integer number (39471927).

Almost surely, 2^78943853 is an apocalyptic number.

It is an amenable number.

78943853 is a deficient number, since it is larger than the sum of its proper divisors (1).

78943853 is an equidigital number, since it uses as much as digits as its factorization.

78943853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 78943853 is about 8885.0353403912. The cubic root of 78943853 is about 428.9823655232.

The spelling of 78943853 in words is "seventy-eight million, nine hundred forty-three thousand, eight hundred fifty-three".