9917428 has 12 divisors (see below), whose sum is σ = 17650080. Its totient is φ = 4874552.

The previous prime is 9917419. The next prime is 9917429. The reversal of 9917428 is 8247199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9917429) 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, 20776 + ... + 21247.

It is an arithmetic number, because the mean of its divisors is an integer number (1470840).

Almost surely, 2^9917428 is an apocalyptic number.

It is an amenable number.

9917428 is a deficient number, since it is larger than the sum of its proper divisors (7732652).

9917428 is a wasteful number, since it uses less digits than its factorization.

9917428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42086 (or 42084 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 9917428 is about 3149.1948177272. The cubic root of 9917428 is about 214.8488427342.

The spelling of 9917428 in words is "nine million, nine hundred seventeen thousand, four hundred twenty-eight".