128138 has 8 divisors (see below), whose sum is σ = 194880. Its totient is φ = 63180.

The previous prime is 128119. The next prime is 128147. The reversal of 128138 is 831821.

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

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248 + ... + 563.

It is an arithmetic number, because the mean of its divisors is an integer number (24360).

2¹²⁸¹³⁸ is an apocalyptic number.

128138 is a deficient number, since it is larger than the sum of its proper divisors (66742).

128138 is an equidigital number, since it uses as much as digits as its factorization.

128138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 384, while the sum is 23.

The square root of 128138 is about 357.9636853090. The cubic root of 128138 is about 50.4149468560.

Adding to 128138 its reverse (831821), we get a palindrome (959959).

It can be divided in two parts, 12813 and 8, that added together give a palindrome (12821).

The spelling of 128138 in words is "one hundred twenty-eight thousand, one hundred thirty-eight".