1216013886 has 24 divisors (see below), whose sum is σ = 2649933000. Its totient is φ = 402993936.

The previous prime is 1216013867. The next prime is 1216013891. The reversal of 1216013886 is 6883106121.

1216013886 is a `hidden beast` number, since 12 + 1 + 601 + 38 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1216013886.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192136 + ... + 198363.

It is an arithmetic number, because the mean of its divisors is an integer number (110413875).

Almost surely, 2^1216013886 is an apocalyptic number.

1216013886 is an abundant number, since it is smaller than the sum of its proper divisors (1433919114).

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

1216013886 is a wasteful number, since it uses less digits than its factorization.

1216013886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390680 (or 390677 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1216013886 is about 34871.3906519370. The cubic root of 1216013886 is about 1067.3647223489.

The spelling of 1216013886 in words is "one billion, two hundred sixteen million, thirteen thousand, eight hundred eighty-six".