1223356128 has 48 divisors (see below), whose sum is σ = 3256557696. Its totient is φ = 402039680.

The previous prime is 1223356111. The next prime is 1223356151. The reversal of 1223356128 is 8216533221.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82926 + ... + 96557.

It is an arithmetic number, because the mean of its divisors is an integer number (67844952).

Almost surely, 2^1223356128 is an apocalyptic number.

It is an amenable number.

1223356128 is an abundant number, since it is smaller than the sum of its proper divisors (2033201568).

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

1223356128 is a wasteful number, since it uses less digits than its factorization.

1223356128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179567 (or 179559 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 1223356128 is about 34976.5082305252. The cubic root of 1223356128 is about 1069.5086479572.

Adding to 1223356128 its reverse (8216533221), we get a palindrome (9439889349).

The spelling of 1223356128 in words is "one billion, two hundred twenty-three million, three hundred fifty-six thousand, one hundred twenty-eight".