138705286 has 8 divisors (see below), whose sum is σ = 208158984. Its totient is φ = 69318960.

The previous prime is 138705271. The next prime is 138705313. The reversal of 138705286 is 682507831.

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

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 3 ways as a sum of consecutive naturals, for example, 11335 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (26019873).

Almost surely, 2^138705286 is an apocalyptic number.

138705286 is a deficient number, since it is larger than the sum of its proper divisors (69453698).

138705286 is a wasteful number, since it uses less digits than its factorization.

138705286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33686.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 138705286 is about 11777.3208328550. The cubic root of 138705286 is about 517.6437849508.

The spelling of 138705286 in words is "one hundred thirty-eight million, seven hundred five thousand, two hundred eighty-six".