1215013860 has 144 divisors (see below), whose sum is σ = 3769758720. Its totient is φ = 316673280.

The previous prime is 1215013837. The next prime is 1215013879. The reversal of 1215013860 is 683105121.

1215013860 is a `hidden beast` number, since 121 + 501 + 38 + 6 + 0 = 666.

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, 2623989 + ... + 2624451.

It is an arithmetic number, because the mean of its divisors is an integer number (26178880).

Almost surely, 2^1215013860 is an apocalyptic number.

1215013860 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 1215013860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1884879360).

1215013860 is an abundant number, since it is smaller than the sum of its proper divisors (2554744860).

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

1215013860 is a wasteful number, since it uses less digits than its factorization.

1215013860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1215013860 is about 34857.0489284449. The cubic root of 1215013860 is about 1067.0720488247.

Adding to 1215013860 its reverse (683105121), we get a palindrome (1898118981).

The spelling of 1215013860 in words is "one billion, two hundred fifteen million, thirteen thousand, eight hundred sixty".