138284181 has 36 divisors (see below), whose sum is σ = 232972896. Its totient is φ = 77410080.

The previous prime is 138284177. The next prime is 138284197. The reversal of 138284181 is 181482831.

It is not a de Polignac number, because 138284181 - 2² = 138284177 is a prime.

It is a super-2 number, since 2×138284181² = 38245029429681522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138284161) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 763911 + ... + 764091.

Almost surely, 2^138284181 is an apocalyptic number.

It is an amenable number.

138284181 is a deficient number, since it is larger than the sum of its proper divisors (94688715).

138284181 is an equidigital number, since it uses as much as digits as its factorization.

138284181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 258 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 138284181 is about 11759.4294504453. The cubic root of 138284181 is about 517.1194036983.

The spelling of 138284181 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, one hundred eighty-one".