978428393 has 2 divisors, whose sum is σ = 978428394. Its totient is φ = 978428392.

The previous prime is 978428327. The next prime is 978428431. The reversal of 978428393 is 393824879.

978428393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655974544 + 322453849 = 25612^2 + 17957^2 .

It is a cyclic number.

It is not a de Polignac number, because 978428393 - 2⁸ = 978428137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (978427393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489214196 + 489214197.

It is an arithmetic number, because the mean of its divisors is an integer number (489214197).

Almost surely, 2^978428393 is an apocalyptic number.

It is an amenable number.

978428393 is a deficient number, since it is larger than the sum of its proper divisors (1).

978428393 is an equidigital number, since it uses as much as digits as its factorization.

978428393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 978428393 is about 31279.8400411511. The cubic root of 978428393 is about 992.7571318458.

The spelling of 978428393 in words is "nine hundred seventy-eight million, four hundred twenty-eight thousand, three hundred ninety-three".