1223128984 has 144 divisors (see below), whose sum is σ = 2972055240. Its totient is φ = 470131200.

The previous prime is 1223128981. The next prime is 1223128993. The reversal of 1223128984 is 4898213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223128981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5075104 + ... + 5075344.

Almost surely, 2^1223128984 is an apocalyptic number.

1223128984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223128984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1486027620).

1223128984 is an abundant number, since it is smaller than the sum of its proper divisors (1748926256).

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

1223128984 is a wasteful number, since it uses less digits than its factorization.

1223128984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 368 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 1223128984 is about 34973.2609860733. The cubic root of 1223128984 is about 1069.4424509592.

The spelling of 1223128984 in words is "one billion, two hundred twenty-three million, one hundred twenty-eight thousand, nine hundred eighty-four".