1216375120 has 40 divisors (see below), whose sum is σ = 2831637960. Its totient is φ = 485936640.

The previous prime is 1216375073. The next prime is 1216375123. The reversal of 1216375120 is 215736121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20322064 + 1196053056 = 4508^2 + 34584^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216375123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57150 + ... + 75490.

It is an arithmetic number, because the mean of its divisors is an integer number (70790949).

Almost surely, 2^1216375120 is an apocalyptic number.

1216375120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216375120 is an abundant number, since it is smaller than the sum of its proper divisors (1615262840).

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

1216375120 is a wasteful number, since it uses less digits than its factorization.

1216375120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19183 (or 19177 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1216375120 is about 34876.5697854591. The cubic root of 1216375120 is about 1067.4704037777.

The spelling of 1216375120 in words is "one billion, two hundred sixteen million, three hundred seventy-five thousand, one hundred twenty".