1543320840 has 128 divisors (see below), whose sum is σ = 4808160000. Its totient is φ = 395824128.

The previous prime is 1543320839. The next prime is 1543320851. The reversal of 1543320840 is 480233451.

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

It is a junction number, because it is equal to n+sod(n) for n = 1543320798 and 1543320807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1102461 + ... + 1103859.

It is an arithmetic number, because the mean of its divisors is an integer number (37563750).

Almost surely, 2^1543320840 is an apocalyptic number.

1543320840 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 1543320840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2404080000).

1543320840 is an abundant number, since it is smaller than the sum of its proper divisors (3264839160).

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

1543320840 is a wasteful number, since it uses less digits than its factorization.

1543320840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759 (or 1755 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1543320840 is about 39285.1223747617. The cubic root of 1543320840 is about 1155.6298208489.

The spelling of 1543320840 in words is "one billion, five hundred forty-three million, three hundred twenty thousand, eight hundred forty".