138000285 has 24 divisors (see below), whose sum is σ = 241895160. Its totient is φ = 72771072.

The previous prime is 138000227. The next prime is 138000293. The reversal of 138000285 is 582000831.

It is a happy number.

138000285 is a `hidden beast` number, since 1 + 380 + 0 + 0 + 285 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6874884 + 131125401 = 2622^2 + 11451^2 .

It is not a de Polignac number, because 138000285 - 2⁶ = 138000221 is a prime.

It is a super-4 number, since 4×138000285⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13224 + ... + 21233.

It is an arithmetic number, because the mean of its divisors is an integer number (10078965).

Almost surely, 2^138000285 is an apocalyptic number.

138000285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138000285 is a deficient number, since it is larger than the sum of its proper divisors (103894875).

138000285 is a wasteful number, since it uses less digits than its factorization.

138000285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34557 (or 34554 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 138000285 is about 11747.3522548700. The cubic root of 138000285 is about 516.7652809801.

The spelling of 138000285 in words is "one hundred thirty-eight million, two hundred eighty-five", and thus it is an aban number.