9915428 has 12 divisors (see below), whose sum is σ = 17636892. Its totient is φ = 4876320.

The previous prime is 9915427. The next prime is 9915457. The reversal of 9915428 is 8245199.

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 9784384 = 362^2 + 3128^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9915391 and 9915400.

It is not an unprimeable number, because it can be changed into a prime (9915421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20075 + ... + 20562.

It is an arithmetic number, because the mean of its divisors is an integer number (1469741).

Almost surely, 2^9915428 is an apocalyptic number.

It is an amenable number.

9915428 is a deficient number, since it is larger than the sum of its proper divisors (7721464).

9915428 is a wasteful number, since it uses less digits than its factorization.

9915428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40702 (or 40700 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 9915428 is about 3148.8772602310. The cubic root of 9915428 is about 214.8343992523.

The spelling of 9915428 in words is "nine million, nine hundred fifteen thousand, four hundred twenty-eight".