126138 has 8 divisors (see below), whose sum is σ = 252288. Its totient is φ = 42044.

The previous prime is 126131. The next prime is 126143. The reversal of 126138 is 831621.

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

126138 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126131) 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, 10506 + ... + 10517.

It is an arithmetic number, because the mean of its divisors is an integer number (31536).

2¹²⁶¹³⁸ is an apocalyptic number.

126138 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.

126138 is a wasteful number, since it uses less digits than its factorization.

126138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21028.

The product of its digits is 288, while the sum is 21.

The square root of 126138 is about 355.1591192691. The cubic root of 126138 is about 50.1512751881.

Adding to 126138 its reverse (831621), we get a palindrome (957759).

It can be divided in two parts, 12613 and 8, that added together give a palindrome (12621).

The spelling of 126138 in words is "one hundred twenty-six thousand, one hundred thirty-eight".