9978018 has 16 divisors (see below), whose sum is σ = 19987776. Its totient is φ = 3320720.

The previous prime is 9977999. The next prime is 9978037. The reversal of 9978018 is 8108799.

It is an interprime number because it is at equal distance from previous prime (9977999) and next prime (9978037).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5380 + ... + 6992.

It is an arithmetic number, because the mean of its divisors is an integer number (1249236).

Almost surely, 2^9978018 is an apocalyptic number.

9978018 is an abundant number, since it is smaller than the sum of its proper divisors (10009758).

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

9978018 is a wasteful number, since it uses less digits than its factorization.

9978018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9978018 is about 3158.8000886413. The cubic root of 9978018 is about 215.2854905793.

The spelling of 9978018 in words is "nine million, nine hundred seventy-eight thousand, eighteen".