978799 has 2 divisors, whose sum is σ = 978800. Its totient is φ = 978798.

The previous prime is 978797. The next prime is 978821. The reversal of 978799 is 997879.

It is a weak prime.

It is an emirp because it is prime and its reverse (997879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978799 - 2¹ = 978797 is a prime.

Together with 978797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489399 + 489400.

It is an arithmetic number, because the mean of its divisors is an integer number (489400).

2⁹⁷⁸⁷⁹⁹ is an apocalyptic number.

978799 is a deficient number, since it is larger than the sum of its proper divisors (1).

978799 is an equidigital number, since it uses as much as digits as its factorization.

978799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 49.

The square root of 978799 is about 989.3427110966. The cubic root of 978799 is about 99.2882460826.

The spelling of 978799 in words is "nine hundred seventy-eight thousand, seven hundred ninety-nine".