1213444144 has 60 divisors (see below), whose sum is σ = 2599864848. Its totient is φ = 548225920.

The previous prime is 1213444121. The next prime is 1213444151. The reversal of 1213444144 is 4414443121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333117 + ... + 336739.

Almost surely, 2^1213444144 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 1213444144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299932424).

1213444144 is an abundant number, since it is smaller than the sum of its proper divisors (1386420704).

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

1213444144 is a wasteful number, since it uses less digits than its factorization.

1213444144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826 (or 3809 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 1213444144 is about 34834.5251725928. The cubic root of 1213444144 is about 1066.6123224049.

Adding to 1213444144 its reverse (4414443121), we get a palindrome (5627887265).

The spelling of 1213444144 in words is "one billion, two hundred thirteen million, four hundred forty-four thousand, one hundred forty-four".