138673285 has 4 divisors (see below), whose sum is σ = 166407948. Its totient is φ = 110938624.

The previous prime is 138673277. The next prime is 138673307. The reversal of 138673285 is 582376831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30492484 + 108180801 = 5522^2 + 10401^2 .

It is a cyclic number.

It is not a de Polignac number, because 138673285 - 2³ = 138673277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13867324 + ... + 13867333.

It is an arithmetic number, because the mean of its divisors is an integer number (41601987).

Almost surely, 2^138673285 is an apocalyptic number.

It is an amenable number.

138673285 is a deficient number, since it is larger than the sum of its proper divisors (27734663).

138673285 is an equidigital number, since it uses as much as digits as its factorization.

138673285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27734662.

The product of its digits is 241920, while the sum is 43.

The square root of 138673285 is about 11775.9621687572. The cubic root of 138673285 is about 517.6039729789.

The spelling of 138673285 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, two hundred eighty-five".