138785 has 8 divisors (see below), whose sum is σ = 170856. Its totient is φ = 108160.

The previous prime is 138763. The next prime is 138793. The reversal of 138785 is 587831.

It can be written as a sum of positive squares in 4 ways, for example, as 20449 + 118336 = 143^2 + 344^2 .

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

It is not a de Polignac number, because 138785 - 2¹⁴ = 122401 is a prime.

It is a super-2 number, since 2×138785² = 38522552450, which contains 22 as substring.

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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134 + ... + 543.

It is an arithmetic number, because the mean of its divisors is an integer number (21357).

2¹³⁸⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

138785 is a deficient number, since it is larger than the sum of its proper divisors (32071).

138785 is an equidigital number, since it uses as much as digits as its factorization.

138785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723.

The product of its digits is 6720, while the sum is 32.

The square root of 138785 is about 372.5385886053. The cubic root of 138785 is about 51.7742929345.

The spelling of 138785 in words is "one hundred thirty-eight thousand, seven hundred eighty-five".