1323031553400 has 96 divisors (see below), whose sum is σ = 4103861264640. Its totient is φ = 352596504960.

The previous prime is 1323031553359. The next prime is 1323031553413. The reversal of 1323031553400 is 43551303231.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338817 + ... + 1661583.

It is an arithmetic number, because the mean of its divisors is an integer number (42748554840).

Almost surely, 2^{1323031553400} is an apocalyptic number.

1323031553400 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 1323031553400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2051930632320).

1323031553400 is an abundant number, since it is smaller than the sum of its proper divisors (2780829711240).

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

1323031553400 is a wasteful number, since it uses less digits than its factorization.

1323031553400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324453 (or 1324444 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 1323031553400 its reverse (43551303231), we get a palindrome (1366582856631).

The spelling of 1323031553400 in words is "one trillion, three hundred twenty-three billion, thirty-one million, five hundred fifty-three thousand, four hundred".