978694459 has 16 divisors (see below), whose sum is σ = 1069092864. Its totient is φ = 893138400.

The previous prime is 978694441. The next prime is 978694501. The reversal of 978694459 is 954496879.

It is a cyclic number.

It is not a de Polignac number, because 978694459 - 2¹¹ = 978692411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 978694397 and 978694406.

It is not an unprimeable number, because it can be changed into a prime (978694159) 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 in 15 ways as a sum of consecutive naturals, for example, 40957 + ... + 60289.

It is an arithmetic number, because the mean of its divisors is an integer number (66818304).

Almost surely, 2^978694459 is an apocalyptic number.

978694459 is a deficient number, since it is larger than the sum of its proper divisors (90398405).

978694459 is a wasteful number, since it uses less digits than its factorization.

978694459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19458.

The product of its digits is 19595520, while the sum is 61.

The square root of 978694459 is about 31284.0927469537. The cubic root of 978694459 is about 992.8471111711.

The spelling of 978694459 in words is "nine hundred seventy-eight million, six hundred ninety-four thousand, four hundred fifty-nine".