1215143240 has 128 divisors (see below), whose sum is σ = 2895782400. Its totient is φ = 458465280.

The previous prime is 1215143191. The next prime is 1215143249. The reversal of 1215143240 is 423415121.

It is not an unprimeable number, because it can be changed into a prime (1215143249) 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, 10753424 + ... + 10753536.

It is an arithmetic number, because the mean of its divisors is an integer number (22623300).

Almost surely, 2^1215143240 is an apocalyptic number.

1215143240 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 1215143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1447891200).

1215143240 is an abundant number, since it is smaller than the sum of its proper divisors (1680639160).

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

1215143240 is a wasteful number, since it uses less digits than its factorization.

1215143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1215143240 is about 34858.9047446990. The cubic root of 1215143240 is about 1067.1099229829.

Adding to 1215143240 its reverse (423415121), we get a palindrome (1638558361).

The spelling of 1215143240 in words is "one billion, two hundred fifteen million, one hundred forty-three thousand, two hundred forty".