9918438 has 16 divisors (see below), whose sum is σ = 19948656. Its totient is φ = 3287520.

The previous prime is 9918421. The next prime is 9918521. The reversal of 9918438 is 8348199.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9918438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3481 + ... + 5652.

It is an arithmetic number, because the mean of its divisors is an integer number (1246791).

Almost surely, 2^9918438 is an apocalyptic number.

9918438 is an abundant number, since it is smaller than the sum of its proper divisors (10030218).

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

9918438 is a wasteful number, since it uses less digits than its factorization.

9918438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9319.

The product of its digits is 62208, while the sum is 42.

The square root of 9918438 is about 3149.3551720948. The cubic root of 9918438 is about 214.8561359546.

The spelling of 9918438 in words is "nine million, nine hundred eighteen thousand, four hundred thirty-eight".