1216203876 has 48 divisors (see below), whose sum is σ = 3164918400. Its totient is φ = 403884576.

The previous prime is 1216203763. The next prime is 1216203881. The reversal of 1216203876 is 6783026121.

1216203876 is a `hidden beast` number, since 1 + 21 + 620 + 3 + 8 + 7 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1216203876.

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, 8121 + ... + 49983.

It is an arithmetic number, because the mean of its divisors is an integer number (65935800).

Almost surely, 2^1216203876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216203876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582459200).

1216203876 is an abundant number, since it is smaller than the sum of its proper divisors (1948714524).

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

1216203876 is a wasteful number, since it uses less digits than its factorization.

1216203876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42145 (or 42137 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1216203876 is about 34874.1146984407. The cubic root of 1216203876 is about 1067.4203078060.

Adding to 1216203876 its reverse (6783026121), we get a palindrome (7999229997).

The spelling of 1216203876 in words is "one billion, two hundred sixteen million, two hundred three thousand, eight hundred seventy-six".