123839944281 has 45 divisors (see below), whose sum is σ = 188371772589. Its totient is φ = 81079833600.

The previous prime is 123839944201. The next prime is 123839944297. The reversal of 123839944281 is 182449938321.

The square root of 123839944281 is 351909.

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

123839944281 is a `hidden beast` number, since 1 + 2 + 38 + 3 + 99 + 442 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2276148681 + 121563795600 = 47709^2 + 348660^2 .

It is not a de Polignac number, because 123839944281 - 2⁹ = 123839943769 is a prime.

It is a super-2 number, since 2×123839944281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123839944201) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 193197721 + ... + 193198361.

Almost surely, 2^123839944281 is an apocalyptic number.

123839944281 is the 351909-th square number.

123839944281 is the 175955-th centered octagonal number.

It is an amenable number.

123839944281 is a deficient number, since it is larger than the sum of its proper divisors (64531828308).

123839944281 is an frugal number, since it uses more digits than its factorization.

123839944281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416 (or 705 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 123839944281 in words is "one hundred twenty-three billion, eight hundred thirty-nine million, nine hundred forty-four thousand, two hundred eighty-one".