138705285 has 8 divisors (see below), whose sum is σ = 221928480. Its totient is φ = 73976144.

The previous prime is 138705271. The next prime is 138705313. The reversal of 138705285 is 582507831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138705285 - 2⁸ = 138705029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4623495 + ... + 4623524.

It is an arithmetic number, because the mean of its divisors is an integer number (27741060).

Almost surely, 2^138705285 is an apocalyptic number.

138705285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138705285 is a deficient number, since it is larger than the sum of its proper divisors (83223195).

138705285 is an equidigital number, since it uses as much as digits as its factorization.

138705285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247027.

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 138705285 is about 11777.3207904005. The cubic root of 138705285 is about 517.6437837068.

The spelling of 138705285 in words is "one hundred thirty-eight million, seven hundred five thousand, two hundred eighty-five".