978647 has 2 divisors, whose sum is σ = 978648. Its totient is φ = 978646.

The previous prime is 978643. The next prime is 978683. The reversal of 978647 is 746879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978647 - 2² = 978643 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978647.

It is not a weakly prime, because it can be changed into another prime (978643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489323 + 489324.

It is an arithmetic number, because the mean of its divisors is an integer number (489324).

2⁹⁷⁸⁶⁴⁷ is an apocalyptic number.

978647 is a deficient number, since it is larger than the sum of its proper divisors (1).

978647 is an equidigital number, since it uses as much as digits as its factorization.

978647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 978647 is about 989.2658894352. The cubic root of 978647 is about 99.2831062481.

The spelling of 978647 in words is "nine hundred seventy-eight thousand, six hundred forty-seven".