1223256532872 has 128 divisors (see below), whose sum is σ = 3428314243200. Its totient is φ = 360500889600.

The previous prime is 1223256532871. The next prime is 1223256532889. The reversal of 1223256532872 is 2782356523221.

It is not an unprimeable number, because it can be changed into a prime (1223256532871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3252954 + ... + 3609462.

It is an arithmetic number, because the mean of its divisors is an integer number (26783705025).

Almost surely, 2^{1223256532872} is an apocalyptic number.

1223256532872 is a gapful number since it is divisible by the number (12) 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 1223256532872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1714157121600).

1223256532872 is an abundant number, since it is smaller than the sum of its proper divisors (2205057710328).

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

1223256532872 is a wasteful number, since it uses less digits than its factorization.

1223256532872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356887 (or 356883 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 48.

The spelling of 1223256532872 in words is "one trillion, two hundred twenty-three billion, two hundred fifty-six million, five hundred thirty-two thousand, eight hundred seventy-two".