9915738 has 48 divisors (see below), whose sum is σ = 23885280. Its totient is φ = 2733024.

The previous prime is 9915721. The next prime is 9915749. The reversal of 9915738 is 8375199.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 9915738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7945 + ... + 9107.

It is an arithmetic number, because the mean of its divisors is an integer number (497610).

Almost surely, 2^9915738 is an apocalyptic number.

9915738 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9915738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11942640).

9915738 is an abundant number, since it is smaller than the sum of its proper divisors (13969542).

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

9915738 is a wasteful number, since it uses less digits than its factorization.

9915738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1204 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 9915738 is about 3148.9264837401. The cubic root of 9915738 is about 214.8366381192.

The spelling of 9915738 in words is "nine million, nine hundred fifteen thousand, seven hundred thirty-eight".