1531143240 has 128 divisors (see below), whose sum is σ = 5074790400. Its totient is φ = 366462720.

The previous prime is 1531143217. The next prime is 1531143283. The reversal of 1531143240 is 423411351.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1531143240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96939 + ... + 111621.

It is an arithmetic number, because the mean of its divisors is an integer number (39646800).

Almost surely, 2^1531143240 is an apocalyptic number.

1531143240 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 1531143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537395200).

1531143240 is an abundant number, since it is smaller than the sum of its proper divisors (3543647160).

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

1531143240 is a wasteful number, since it uses less digits than its factorization.

1531143240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787 (or 14783 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1531143240 is about 39129.8254532269. The cubic root of 1531143240 is about 1152.5822854436.

Adding to 1531143240 its reverse (423411351), we get a palindrome (1954554591).

The spelling of 1531143240 in words is "one billion, five hundred thirty-one million, one hundred forty-three thousand, two hundred forty".