1215998928 has 120 divisors (see below), whose sum is σ = 3485750112. Its totient is φ = 395576064.

The previous prime is 1215998911. The next prime is 1215998929. The reversal of 1215998928 is 8298995121.

1215998928 is a `hidden beast` number, since 1 + 21 + 599 + 8 + 9 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215998929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2159575 + ... + 2160137.

Almost surely, 2^1215998928 is an apocalyptic number.

1215998928 is a gapful number since it is divisible by the number (18) 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 1215998928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742875056).

1215998928 is an abundant number, since it is smaller than the sum of its proper divisors (2269751184).

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

1215998928 is a wasteful number, since it uses less digits than its factorization.

1215998928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 904 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 1215998928 is about 34871.1761774678. The cubic root of 1215998928 is about 1067.3603458345.

The spelling of 1215998928 in words is "one billion, two hundred fifteen million, nine hundred ninety-eight thousand, nine hundred twenty-eight".