9918478 has 8 divisors (see below), whose sum is σ = 15121800. Its totient is φ = 4877880.

The previous prime is 9918421. The next prime is 9918521. The reversal of 9918478 is 8748199.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 40528 + ... + 40771.

It is an arithmetic number, because the mean of its divisors is an integer number (1890225).

Almost surely, 2^9918478 is an apocalyptic number.

9918478 is a deficient number, since it is larger than the sum of its proper divisors (5203322).

9918478 is a wasteful number, since it uses less digits than its factorization.

9918478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81362.

The product of its digits is 145152, while the sum is 46.

The square root of 9918478 is about 3149.3615225947. The cubic root of 9918478 is about 214.8564247848.

The spelling of 9918478 in words is "nine million, nine hundred eighteen thousand, four hundred seventy-eight".