138758 has 4 divisors (see below), whose sum is σ = 208140. Its totient is φ = 69378.

The previous prime is 138739. The next prime is 138763. The reversal of 138758 is 857831.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138758.

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 as a sum of consecutive naturals, namely, 34688 + ... + 34691.

It is an arithmetic number, because the mean of its divisors is an integer number (52035).

2¹³⁸⁷⁵⁸ is an apocalyptic number.

138758 is a deficient number, since it is larger than the sum of its proper divisors (69382).

138758 is an equidigital number, since it uses as much as digits as its factorization.

138758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69381.

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

The square root of 138758 is about 372.5023489859. The cubic root of 138758 is about 51.7709352311.

The spelling of 138758 in words is "one hundred thirty-eight thousand, seven hundred fifty-eight".