78238843 has 2 divisors, whose sum is σ = 78238844. Its totient is φ = 78238842.

The previous prime is 78238819. The next prime is 78238873. The reversal of 78238843 is 34883287.

It is a weak prime.

It is an emirp because it is prime and its reverse (34883287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78238843 - 2²⁵ = 44684411 is a prime.

It is a super-3 number, since 3×78238843³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 78238843.

It is not a weakly prime, because it can be changed into another prime (78238873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39119421 + 39119422.

It is an arithmetic number, because the mean of its divisors is an integer number (39119422).

Almost surely, 2^78238843 is an apocalyptic number.

78238843 is a deficient number, since it is larger than the sum of its proper divisors (1).

78238843 is an equidigital number, since it uses as much as digits as its factorization.

78238843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 78238843 is about 8845.2723530709. The cubic root of 78238843 is about 427.7015326016.

The spelling of 78238843 in words is "seventy-eight million, two hundred thirty-eight thousand, eight hundred forty-three".