1215323928 has 192 divisors, whose sum is σ = 4072723200. Its totient is φ = 318816000.

The previous prime is 1215323917. The next prime is 1215323951. The reversal of 1215323928 is 8293235121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1215323892 and 1215323901.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1644183 + ... + 1644921.

It is an arithmetic number, because the mean of its divisors is an integer number (21212100).

Almost surely, 2^1215323928 is an apocalyptic number.

1215323928 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 1215323928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2036361600).

1215323928 is an abundant number, since it is smaller than the sum of its proper divisors (2857399272).

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

1215323928 is a wasteful number, since it uses less digits than its factorization.

1215323928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1015 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1215323928 is about 34861.4963534269. The cubic root of 1215323928 is about 1067.1628123311.

The spelling of 1215323928 in words is "one billion, two hundred fifteen million, three hundred twenty-three thousand, nine hundred twenty-eight".