It is a semiprime because it is the product of two primes.
It is a Curzon number.
It is a congruent number.
It is an unprimeable number.
78398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
278398 is an apocalyptic number.
78398 is a wasteful number, since it uses less digits than its factorization.
78398 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 39201.
The square root of 78398 is about 279.9964285487. The cubic root of 78398 is about 42.7991352782.
The spelling of 78398 in words is "seventy-eight thousand, three hundred ninety-eight".