1213998516 has 30 divisors (see below), whose sum is σ = 3173632770. Its totient is φ = 404666064.

The previous prime is 1213998503. The next prime is 1213998517. The reversal of 1213998516 is 6158993121.

1213998516 is a `hidden beast` number, since 12 + 1 + 39 + 98 + 516 = 666.

It can be written as a sum of positive squares in only one way, i.e., 912281616 + 301716900 = 30204^2 + 17370^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213998517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1873131 + ... + 1873778.

It is an arithmetic number, because the mean of its divisors is an integer number (105787759).

Almost surely, 2^1213998516 is an apocalyptic number.

It is an amenable number.

1213998516 is an abundant number, since it is smaller than the sum of its proper divisors (1959634254).

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

1213998516 is a wasteful number, since it uses less digits than its factorization.

1213998516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746925 (or 3746914 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1213998516 is about 34842.4814845326. The cubic root of 1213998516 is about 1066.7747278977.

The spelling of 1213998516 in words is "one billion, two hundred thirteen million, nine hundred ninety-eight thousand, five hundred sixteen".