9978558 has 16 divisors (see below), whose sum is σ = 21131280. Its totient is φ = 3130496.

The previous prime is 9978557. The next prime is 9978583. The reversal of 9978558 is 8558799.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 9978558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48813 + ... + 49016.

It is an arithmetic number, because the mean of its divisors is an integer number (1320705).

Almost surely, 2^9978558 is an apocalyptic number.

9978558 is an abundant number, since it is smaller than the sum of its proper divisors (11152722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9978558 is a wasteful number, since it uses less digits than its factorization.

9978558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97851.

The product of its digits is 907200, while the sum is 51.

The square root of 9978558 is about 3158.8855629795. The cubic root of 9978558 is about 215.2893741852.

The spelling of 9978558 in words is "nine million, nine hundred seventy-eight thousand, five hundred fifty-eight".