138874730281 has 27 divisors (see below), whose sum is σ = 163144696221. Its totient is φ = 117870551064.

The previous prime is 138874730221. The next prime is 138874730329. The reversal of 138874730281 is 182037478831.

The square root of 138874730281 is 372659.

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

It is not a de Polignac number, because 138874730281 - 2¹⁷ = 138874599209 is a prime.

It is a super-2 number, since 2×138874730281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138874730201) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 362597016 + ... + 362597398.

Almost surely, 2^138874730281 is an apocalyptic number.

138874730281 is the 372659-th square number.

138874730281 is the 186330-th centered octagonal number.

It is an amenable number.

138874730281 is a deficient number, since it is larger than the sum of its proper divisors (24269965940).

138874730281 is an frugal number, since it uses more digits than its factorization.

138874730281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 138874730281 in words is "one hundred thirty-eight billion, eight hundred seventy-four million, seven hundred thirty thousand, two hundred eighty-one".