1321440444 has 36 divisors (see below), whose sum is σ = 3352658400. Its totient is φ = 438851520.

The previous prime is 1321440437. The next prime is 1321440451. The reversal of 1321440444 is 4440441231.

1321440444 is a `hidden beast` number, since 1 + 3 + 214 + 4 + 0 + 444 = 666.

It is an interprime number because it is at equal distance from previous prime (1321440437) and next prime (1321440451).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57969 + ... + 77480.

It is an arithmetic number, because the mean of its divisors is an integer number (93129400).

Almost surely, 2^1321440444 is an apocalyptic number.

It is an amenable number.

1321440444 is an abundant number, since it is smaller than the sum of its proper divisors (2031217956).

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

1321440444 is a wasteful number, since it uses less digits than its factorization.

1321440444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135730 (or 135725 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 1321440444 is about 36351.6223021752. The cubic root of 1321440444 is about 1097.3601834469.

Adding to 1321440444 its reverse (4440441231), we get a palindrome (5761881675).

The spelling of 1321440444 in words is "one billion, three hundred twenty-one million, four hundred forty thousand, four hundred forty-four".