1216987200 has 672 divisors, whose sum is σ = 5238414720. Its totient is φ = 270950400.

The previous prime is 1216987171. The next prime is 1216987231. The reversal of 1216987200 is 27896121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6177502 + ... + 6177698.

It is an arithmetic number, because the mean of its divisors is an integer number (7795260).

Almost surely, 2^1216987200 is an apocalyptic number.

1216987200 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 1216987200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2619207360).

1216987200 is an abundant number, since it is smaller than the sum of its proper divisors (4021427520).

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

1216987200 is a wasteful number, since it uses less digits than its factorization.

1216987200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1216987200 is about 34885.3436273745. The cubic root of 1216987200 is about 1067.6494241341.

The spelling of 1216987200 in words is "one billion, two hundred sixteen million, nine hundred eighty-seven thousand, two hundred".