138426 has 8 divisors (see below), whose sum is σ = 276864. Its totient is φ = 46140.

The previous prime is 138407. The next prime is 138427. The reversal of 138426 is 624831.

It is a happy number.

138426 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.

138426 is an admirable number.

It is a d-powerful number, because it can be written as 1 + 3⁸ + 4³ + 8³ + 2¹⁷ + 6³ .

It is a junction number, because it is equal to n+sod(n) for n = 138396 and 138405.

It is not an unprimeable number, because it can be changed into a prime (138427) by changing a digit.

138426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11530 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (34608).

2¹³⁸⁴²⁶ is an apocalyptic number.

138426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138426 is a wasteful number, since it uses less digits than its factorization.

138426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23076.

The product of its digits is 1152, while the sum is 24.

The square root of 138426 is about 372.0564473302. The cubic root of 138426 is about 51.7296122635.

The spelling of 138426 in words is "one hundred thirty-eight thousand, four hundred twenty-six".