138646 has 8 divisors (see below), whose sum is σ = 209664. Its totient is φ = 68760.

The previous prime is 138641. The next prime is 138647. The reversal of 138646 is 646831.

138646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2¹³⁸⁶⁴⁶ is an apocalyptic number.

138646 is a deficient number, since it is larger than the sum of its proper divisors (71018).

138646 is a wasteful number, since it uses less digits than its factorization.

138646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its digits is 3456, while the sum is 28.

The square root of 138646 is about 372.3519840151. The cubic root of 138646 is about 51.7570023275.

It can be divided in two parts, 138 and 646, that added together give a square (784 = 28²).

The spelling of 138646 in words is "one hundred thirty-eight thousand, six hundred forty-six".