1543400431320 has 256 divisors, whose sum is σ = 5115136780800. Its totient is φ = 369428336640.

The previous prime is 1543400431301. The next prime is 1543400431337. The reversal of 1543400431320 is 231340043451.

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 polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 86103879 + ... + 86121801.

It is an arithmetic number, because the mean of its divisors is an integer number (19981003050).

Almost surely, 2^{1543400431320} is an apocalyptic number.

1543400431320 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 1543400431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2557568390400).

1543400431320 is an abundant number, since it is smaller than the sum of its proper divisors (3571736349480).

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

1543400431320 is a wasteful number, since it uses less digits than its factorization.

1543400431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18770 (or 18766 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 1543400431320 its reverse (231340043451), we get a palindrome (1774740474771).

The spelling of 1543400431320 in words is "one trillion, five hundred forty-three billion, four hundred million, four hundred thirty-one thousand, three hundred twenty".