981228 has 12 divisors (see below), whose sum is σ = 2289560. Its totient is φ = 327072.

The previous prime is 981221. The next prime is 981241. The reversal of 981228 is 822189.

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

It is a junction number, because it is equal to n+sod(n) for n = 981195 and 981204.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981228.

It is not an unprimeable number, because it can be changed into a prime (981221) by changing a digit.

981228 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 40873 + ... + 40896.

2⁹⁸¹²²⁸ is an apocalyptic number.

It is an amenable number.

981228 is an abundant number, since it is smaller than the sum of its proper divisors (1308332).

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

981228 is a wasteful number, since it uses less digits than its factorization.

981228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81776 (or 81774 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 981228 is about 990.5695331475. The cubic root of 981228 is about 99.3703098930.

It can be divided in two parts, 98 and 1228, that added together give a triangular number (1326 = T₅₁).

The spelling of 981228 in words is "nine hundred eighty-one thousand, two hundred twenty-eight".