138607 has 4 divisors (see below), whose sum is σ = 158416. Its totient is φ = 118800.

The previous prime is 138599. The next prime is 138617. The reversal of 138607 is 706831.

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

It is a cyclic number.

It is not a de Polignac number, because 138607 - 2³ = 138599 is a prime.

It is a Duffinian number.

138607 is a lucky number.

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 138607.

It is not an unprimeable number, because it can be changed into a prime (138617) by changing a digit.

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, 9894 + ... + 9907.

It is an arithmetic number, because the mean of its divisors is an integer number (39604).

2¹³⁸⁶⁰⁷ is an apocalyptic number.

138607 is a deficient number, since it is larger than the sum of its proper divisors (19809).

138607 is an equidigital number, since it uses as much as digits as its factorization.

138607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19808.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 138607 is about 372.2996105289. The cubic root of 138607 is about 51.7521489302.

It can be divided in two parts, 13860 and 7, that multiplied together give a triangular number (97020 = T₄₄₀).

The spelling of 138607 in words is "one hundred thirty-eight thousand, six hundred seven".