978363839 has 2 divisors, whose sum is σ = 978363840. Its totient is φ = 978363838.

The previous prime is 978363833. The next prime is 978363863. The reversal of 978363839 is 938363879.

It is a weak prime.

It is an emirp because it is prime and its reverse (938363879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978363839 - 2⁴ = 978363823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978363833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489181919 + 489181920.

It is an arithmetic number, because the mean of its divisors is an integer number (489181920).

Almost surely, 2^978363839 is an apocalyptic number.

978363839 is a deficient number, since it is larger than the sum of its proper divisors (1).

978363839 is an equidigital number, since it uses as much as digits as its factorization.

978363839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The square root of 978363839 is about 31278.8081454521. The cubic root of 978363839 is about 992.7352982421.

The spelling of 978363839 in words is "nine hundred seventy-eight million, three hundred sixty-three thousand, eight hundred thirty-nine".