978978979 has 8 divisors (see below), whose sum is σ = 1092814272. Its totient is φ = 869283240.

The previous prime is 978978919. The next prime is 978978997. The reversal of 978978979 is 979879879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 978978979 - 2⁹ = 978978467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978978919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034389 + ... + 1035334.

It is an arithmetic number, because the mean of its divisors is an integer number (136601784).

Almost surely, 2^978978979 is an apocalyptic number.

978978979 is a deficient number, since it is larger than the sum of its proper divisors (113835293).

978978979 is a wasteful number, since it uses less digits than its factorization.

978978979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069777.

The product of its digits is 144027072, while the sum is 73.

The square root of 978978979 is about 31288.6397754840. The cubic root of 978978979 is about 992.9433133064.

The spelling of 978978979 in words is "nine hundred seventy-eight million, nine hundred seventy-eight thousand, nine hundred seventy-nine".