1215532980 has 480 divisors, whose sum is σ = 4478664960. Its totient is φ = 273715200.

The previous prime is 1215532979. The next prime is 1215533009. The reversal of 1215532980 is 892355121.

1215532980 is a `hidden beast` number, since 1 + 2 + 1 + 553 + 29 + 80 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12034930 + ... + 12035030.

It is an arithmetic number, because the mean of its divisors is an integer number (9330552).

Almost surely, 2^1215532980 is an apocalyptic number.

1215532980 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 1215532980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2239332480).

1215532980 is an abundant number, since it is smaller than the sum of its proper divisors (3263131980).

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

1215532980 is a wasteful number, since it uses less digits than its factorization.

1215532980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1215532980 is about 34864.4945467448. The cubic root of 1215532980 is about 1067.2239975906.

The spelling of 1215532980 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, nine hundred eighty".