1213613344 has 96 divisors (see below), whose sum is σ = 2544696000. Its totient is φ = 568888320.

The previous prime is 1213613339. The next prime is 1213613347. The reversal of 1213613344 is 4433163121.

It is not an unprimeable number, because it can be changed into a prime (1213613347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8144982 + ... + 8145130.

It is an arithmetic number, because the mean of its divisors is an integer number (26507250).

Almost surely, 2^1213613344 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 1213613344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272348000).

1213613344 is an abundant number, since it is smaller than the sum of its proper divisors (1331082656).

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

1213613344 is a wasteful number, since it uses less digits than its factorization.

1213613344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 378 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 1213613344 is about 34836.9537129755. The cubic root of 1213613344 is about 1066.6618954648.

Adding to 1213613344 its reverse (4433163121), we get a palindrome (5646776465).

The spelling of 1213613344 in words is "one billion, two hundred thirteen million, six hundred thirteen thousand, three hundred forty-four".