1403144321320 has 128 divisors (see below), whose sum is σ = 3765888806400. Its totient is φ = 460047937536.

The previous prime is 1403144321291. The next prime is 1403144321323. The reversal of 1403144321320 is 231234413041.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1403144321323) 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, 28369252 + ... + 28418668.

It is an arithmetic number, because the mean of its divisors is an integer number (29421006300).

Almost surely, 2^{1403144321320} is an apocalyptic number.

1403144321320 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 1403144321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882944403200).

1403144321320 is an abundant number, since it is smaller than the sum of its proper divisors (2362744485080).

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

1403144321320 is a wasteful number, since it uses less digits than its factorization.

1403144321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53867 (or 53863 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1403144321320 its reverse (231234413041), we get a palindrome (1634378734361).

The spelling of 1403144321320 in words is "one trillion, four hundred three billion, one hundred forty-four million, three hundred twenty-one thousand, three hundred twenty".