1215274320 has 320 divisors, whose sum is σ = 4559708160. Its totient is φ = 295723008.

The previous prime is 1215274273. The next prime is 1215274321. The reversal of 1215274320 is 234725121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215274321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3172849 + ... + 3173231.

It is an arithmetic number, because the mean of its divisors is an integer number (14249088).

Almost surely, 2^1215274320 is an apocalyptic number.

1215274320 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 1215274320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2279854080).

1215274320 is an abundant number, since it is smaller than the sum of its proper divisors (3344433840).

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

1215274320 is a wasteful number, since it uses less digits than its factorization.

1215274320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1215274320 is about 34860.7848448654. The cubic root of 1215274320 is about 1067.1482920506.

Adding to 1215274320 its reverse (234725121), we get a palindrome (1449999441).

The spelling of 1215274320 in words is "one billion, two hundred fifteen million, two hundred seventy-four thousand, three hundred twenty".