978660923 has 2 divisors, whose sum is σ = 978660924. Its totient is φ = 978660922.

The previous prime is 978660887. The next prime is 978660937. The reversal of 978660923 is 329066879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978660923 - 2²⁰ = 977612347 is a prime.

It is not a weakly prime, because it can be changed into another prime (978660983) 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, 489330461 + 489330462.

It is an arithmetic number, because the mean of its divisors is an integer number (489330462).

Almost surely, 2^978660923 is an apocalyptic number.

978660923 is a deficient number, since it is larger than the sum of its proper divisors (1).

978660923 is an equidigital number, since it uses as much as digits as its factorization.

978660923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 978660923 is about 31283.5567511113. The cubic root of 978660923 is about 992.8357707230.

The spelling of 978660923 in words is "nine hundred seventy-eight million, six hundred sixty thousand, nine hundred twenty-three".