1215532940 has 48 divisors (see below), whose sum is σ = 2644717824. Its totient is φ = 468787200.

The previous prime is 1215532939. The next prime is 1215532979. The reversal of 1215532940 is 492355121.

It is a junction number, because it is equal to n+sod(n) for n = 1215532897 and 1215532906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170732 + ... + 177708.

It is an arithmetic number, because the mean of its divisors is an integer number (55098288).

Almost surely, 2^1215532940 is an apocalyptic number.

1215532940 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 1215532940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322358912).

1215532940 is an abundant number, since it is smaller than the sum of its proper divisors (1429184884).

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

1215532940 is a wasteful number, since it uses less digits than its factorization.

1215532940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7298 (or 7296 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1215532940 is about 34864.4939730953. The cubic root of 1215532940 is about 1067.2239858841.

The spelling of 1215532940 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, nine hundred forty".