78855239 has 2 divisors, whose sum is σ = 78855240. Its totient is φ = 78855238.

The previous prime is 78855233. The next prime is 78855241. The reversal of 78855239 is 93255887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78855239 - 2⁴ = 78855223 is a prime.

Together with 78855241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78855193 and 78855202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78855233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39427619 + 39427620.

It is an arithmetic number, because the mean of its divisors is an integer number (39427620).

Almost surely, 2^78855239 is an apocalyptic number.

78855239 is a deficient number, since it is larger than the sum of its proper divisors (1).

78855239 is an equidigital number, since it uses as much as digits as its factorization.

78855239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 78855239 is about 8880.0472408653. The cubic root of 78855239 is about 428.8217953872.

The spelling of 78855239 in words is "seventy-eight million, eight hundred fifty-five thousand, two hundred thirty-nine".