1213820608 has 112 divisors (see below), whose sum is σ = 3234196224. Its totient is φ = 436515840.

The previous prime is 1213820521. The next prime is 1213820623. The reversal of 1213820608 is 8060283121.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 1213820608.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54591 + ... + 73537.

It is an arithmetic number, because the mean of its divisors is an integer number (28876752).

Almost surely, 2^1213820608 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 1213820608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617098112).

1213820608 is an abundant number, since it is smaller than the sum of its proper divisors (2020375616).

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

1213820608 is a wasteful number, since it uses less digits than its factorization.

1213820608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18990 (or 18980 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1213820608 is about 34839.9283581353. The cubic root of 1213820608 is about 1066.7226144265.

The spelling of 1213820608 in words is "one billion, two hundred thirteen million, eight hundred twenty thousand, six hundred eight".