1543142340 has 144 divisors (see below), whose sum is σ = 4889102400. Its totient is φ = 408551040.

The previous prime is 1543142339. The next prime is 1543142389. The reversal of 1543142340 is 432413451.

It is a happy number.

1543142340 is a `hidden beast` number, since 1 + 5 + 4 + 314 + 2 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 723075 + ... + 725205.

It is an arithmetic number, because the mean of its divisors is an integer number (33952100).

Almost surely, 2^1543142340 is an apocalyptic number.

1543142340 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 1543142340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2444551200).

1543142340 is an abundant number, since it is smaller than the sum of its proper divisors (3345960060).

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

1543142340 is a wasteful number, since it uses less digits than its factorization.

1543142340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1543142340 is about 39282.8504566560. The cubic root of 1543142340 is about 1155.5852658713.

Adding to 1543142340 its reverse (432413451), we get a palindrome (1975555791).

The spelling of 1543142340 in words is "one billion, five hundred forty-three million, one hundred forty-two thousand, three hundred forty".