12538842440 has 16 divisors (see below), whose sum is σ = 28212395580. Its totient is φ = 5015536960.

The previous prime is 12538842431. The next prime is 12538842493. The reversal of 12538842440 is 4424883521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12232802404 + 306040036 = 110602^2 + 17494^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156735491 + ... + 156735570.

Almost surely, 2^12538842440 is an apocalyptic number.

12538842440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12538842440 is an abundant number, since it is smaller than the sum of its proper divisors (15673553140).

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

12538842440 is a wasteful number, since it uses less digits than its factorization.

12538842440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313471072 (or 313471068 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 41.

The spelling of 12538842440 in words is "twelve billion, five hundred thirty-eight million, eight hundred forty-two thousand, four hundred forty".