1209856228 has 48 divisors (see below), whose sum is σ = 2476656000. Its totient is φ = 506398464.

The previous prime is 1209856199. The next prime is 1209856247. The reversal of 1209856228 is 8226589021.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 344023 + ... + 347521.

It is an arithmetic number, because the mean of its divisors is an integer number (51597000).

Almost surely, 2^1209856228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209856228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238328000).

1209856228 is an abundant number, since it is smaller than the sum of its proper divisors (1266799772).

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

1209856228 is a wasteful number, since it uses less digits than its factorization.

1209856228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796 (or 3794 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1209856228 is about 34782.9876232620. The cubic root of 1209856228 is about 1065.5600302010.

The spelling of 1209856228 in words is "one billion, two hundred nine million, eight hundred fifty-six thousand, two hundred twenty-eight".