1231440444 has 36 divisors (see below), whose sum is σ = 3352255816. Its totient is φ = 378904608.

The previous prime is 1231440443. The next prime is 1231440451. The reversal of 1231440444 is 4440441321.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231440443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1315174 + ... + 1316109.

Almost surely, 2^1231440444 is an apocalyptic number.

It is an amenable number.

1231440444 is an abundant number, since it is smaller than the sum of its proper divisors (2120815372).

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

1231440444 is a wasteful number, since it uses less digits than its factorization.

1231440444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631306 (or 2631301 counting only the distinct ones).

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

The square root of 1231440444 is about 35091.8857287550. The cubic root of 1231440444 is about 1071.8593588699.

Adding to 1231440444 its reverse (4440441321), we get a palindrome (5671881765).

The spelling of 1231440444 in words is "one billion, two hundred thirty-one million, four hundred forty thousand, four hundred forty-four".