1216388250 has 576 divisors, whose sum is σ = 4494372480. Its totient is φ = 233856000.

The previous prime is 1216388221. The next prime is 1216388293. The reversal of 1216388250 is 528836121.

It is a happy number.

1216388250 is a `hidden beast` number, since 1 + 21 + 6 + 388 + 250 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 20616721 + ... + 20616779.

It is an arithmetic number, because the mean of its divisors is an integer number (7802730).

Almost surely, 2^1216388250 is an apocalyptic number.

1216388250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216388250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2247186240).

1216388250 is an abundant number, since it is smaller than the sum of its proper divisors (3277984230).

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

1216388250 is a wasteful number, since it uses less digits than its factorization.

1216388250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1216388250 is about 34876.7580202059. The cubic root of 1216388250 is about 1067.4742446532.

The spelling of 1216388250 in words is "one billion, two hundred sixteen million, three hundred eighty-eight thousand, two hundred fifty".