9915390 has 72 divisors (see below), whose sum is σ = 26903448. Its totient is φ = 2533440.

The previous prime is 9915379. The next prime is 9915391. The reversal of 9915390 is 935199.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9915391) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75625 + ... + 75755.

It is an arithmetic number, because the mean of its divisors is an integer number (373659).

Almost surely, 2^9915390 is an apocalyptic number.

9915390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9915390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13451724).

9915390 is an abundant number, since it is smaller than the sum of its proper divisors (16988058).

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

9915390 is a wasteful number, since it uses less digits than its factorization.

9915390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 9915390 is about 3148.8712263286. The cubic root of 9915390 is about 214.8341248074.

The spelling of 9915390 in words is "nine million, nine hundred fifteen thousand, three hundred ninety".