1231444440 has 96 divisors (see below), whose sum is σ = 4050511920. Its totient is φ = 324420864.

The previous prime is 1231444433. The next prime is 1231444441. The reversal of 1231444440 is 444441321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231444441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9274 + ... + 50486.

Almost surely, 2^1231444440 is an apocalyptic number.

1231444440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231444440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2025255960).

1231444440 is an abundant number, since it is smaller than the sum of its proper divisors (2819067480).

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

1231444440 is a wasteful number, since it uses less digits than its factorization.

1231444440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41313 (or 41306 counting only the distinct ones).

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

The square root of 1231444440 is about 35091.9426649480. The cubic root of 1231444440 is about 1071.8605182561.

Adding to 1231444440 its reverse (444441321), we get a palindrome (1675885761).

The spelling of 1231444440 in words is "one billion, two hundred thirty-one million, four hundred forty-four thousand, four hundred forty".