138263498244 has 81 divisors (see below), whose sum is σ = 362136137727. Its totient is φ = 44477774208.

The previous prime is 138263498203. The next prime is 138263498297. The reversal of 138263498244 is 442894362831.

It is a happy number.

The square root of 138263498244 is 371838.

It is a perfect power (a square), and thus also a powerful number.

138263498244 is a `hidden beast` number, since 1 + 38 + 26 + 349 + 8 + 244 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 37337832900 + 100925665344 = 193230^2 + 317688^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 64698744 + ... + 64700880.

Almost surely, 2^138263498244 is an apocalyptic number.

138263498244 is the 371838-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138263498244

138263498244 is an abundant number, since it is smaller than the sum of its proper divisors (223872639483).

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

138263498244 is an equidigital number, since it uses as much as digits as its factorization.

138263498244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4342 (or 2171 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 54.

The spelling of 138263498244 in words is "one hundred thirty-eight billion, two hundred sixty-three million, four hundred ninety-eight thousand, two hundred forty-four".