1218913344 has 126 divisors (see below), whose sum is σ = 3840506670. Its totient is φ = 369346560.

The previous prime is 1218913331. The next prime is 1218913351. The reversal of 1218913344 is 4433198121.

It can be written as a sum of positive squares in only one way, i.e., 629006400 + 589906944 = 25080^2 + 24288^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1218913299 and 1218913308.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 60952 + ... + 78440.

Almost surely, 2^1218913344 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 1218913344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920253335).

1218913344 is an abundant number, since it is smaller than the sum of its proper divisors (2621593326).

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

1218913344 is a wasteful number, since it uses less digits than its factorization.

1218913344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17529 (or 17505 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1218913344 is about 34912.9394924002. The cubic root of 1218913344 is about 1068.2123888506.

The spelling of 1218913344 in words is "one billion, two hundred eighteen million, nine hundred thirteen thousand, three hundred forty-four".