9981228 has 12 divisors (see below), whose sum is σ = 23289560. Its totient is φ = 3327072.

The previous prime is 9981221. The next prime is 9981229. The reversal of 9981228 is 8221899.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (9981221) 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, 415873 + ... + 415896.

Almost surely, 2^9981228 is an apocalyptic number.

It is an amenable number.

9981228 is an abundant number, since it is smaller than the sum of its proper divisors (13308332).

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

9981228 is a wasteful number, since it uses less digits than its factorization.

9981228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831776 (or 831774 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 9981228 is about 3159.3081521118. The cubic root of 9981228 is about 215.3085743999.

The spelling of 9981228 in words is "nine million, nine hundred eighty-one thousand, two hundred twenty-eight".