1216882378 has 8 divisors (see below), whose sum is σ = 1869843780. Its totient is φ = 593601120.

The previous prime is 1216882357. The next prime is 1216882391. The reversal of 1216882378 is 8732886121.

It can be written as a sum of positive squares in 2 ways, for example, as 1097133129 + 119749249 = 33123^2 + 10943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 7419933 + ... + 7420096.

Almost surely, 2^1216882378 is an apocalyptic number.

1216882378 is a deficient number, since it is larger than the sum of its proper divisors (652961402).

1216882378 is a wasteful number, since it uses less digits than its factorization.

1216882378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14840072.

The product of its digits is 258048, while the sum is 46.

The square root of 1216882378 is about 34883.8412162422. The cubic root of 1216882378 is about 1067.6187701931.

The spelling of 1216882378 in words is "one billion, two hundred sixteen million, eight hundred eighty-two thousand, three hundred seventy-eight".