128438 has 8 divisors (see below), whose sum is σ = 194400. Its totient is φ = 63640.

The previous prime is 128437. The next prime is 128449. The reversal of 128438 is 834821.

128438 is nontrivially palindromic in base 6.

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

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128431) 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, 83 + ... + 513.

It is an arithmetic number, because the mean of its divisors is an integer number (24300).

2¹²⁸⁴³⁸ is an apocalyptic number.

128438 is a deficient number, since it is larger than the sum of its proper divisors (65962).

128438 is a wasteful number, since it uses less digits than its factorization.

128438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582.

The product of its digits is 1536, while the sum is 26.

The square root of 128438 is about 358.3824772502. The cubic root of 128438 is about 50.4542604505.

The spelling of 128438 in words is "one hundred twenty-eight thousand, four hundred thirty-eight".