1223544402400 has 144 divisors (see below), whose sum is σ = 3060833656608. Its totient is φ = 477324288000.

The previous prime is 1223544402391. The next prime is 1223544402427. The reversal of 1223544402400 is 42044453221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192893629 + ... + 192899971.

It is an arithmetic number, because the mean of its divisors is an integer number (21255789282).

Almost surely, 2^{1223544402400} is an apocalyptic number.

1223544402400 is a gapful number since it is divisible by the number (10) 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 1223544402400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530416828304).

1223544402400 is an abundant number, since it is smaller than the sum of its proper divisors (1837289254208).

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

1223544402400 is a wasteful number, since it uses less digits than its factorization.

1223544402400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12285 (or 12272 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 1223544402400 its reverse (42044453221), we get a palindrome (1265588855621).

The spelling of 1223544402400 in words is "one trillion, two hundred twenty-three billion, five hundred forty-four million, four hundred two thousand, four hundred".