138718 has 8 divisors (see below), whose sum is σ = 213048. Its totient is φ = 67704.

The previous prime is 138683. The next prime is 138727. The reversal of 138718 is 817831.

It is a happy number.

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, 721 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (26631).

2¹³⁸⁷¹⁸ is an apocalyptic number.

138718 is a deficient number, since it is larger than the sum of its proper divisors (74330).

138718 is a wasteful number, since it uses less digits than its factorization.

138718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its digits is 1344, while the sum is 28.

The square root of 138718 is about 372.4486541793. The cubic root of 138718 is about 51.7659600551.

The spelling of 138718 in words is "one hundred thirty-eight thousand, seven hundred eighteen".