128338437 has 4 divisors (see below), whose sum is σ = 171117920. Its totient is φ = 85558956.

The previous prime is 128338421. The next prime is 128338471. The reversal of 128338437 is 734833821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734833821 = 3 ⋅244944607.

It is not a de Polignac number, because 128338437 - 2⁴ = 128338421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128338395 and 128338404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128338417) 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, 21389737 + ... + 21389742.

It is an arithmetic number, because the mean of its divisors is an integer number (42779480).

Almost surely, 2^128338437 is an apocalyptic number.

It is an amenable number.

128338437 is a deficient number, since it is larger than the sum of its proper divisors (42779483).

128338437 is an equidigital number, since it uses as much as digits as its factorization.

128338437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42779482.

The product of its digits is 96768, while the sum is 39.

The square root of 128338437 is about 11328.6555689543. The cubic root of 128338437 is about 504.4121997933.

The spelling of 128338437 in words is "one hundred twenty-eight million, three hundred thirty-eight thousand, four hundred thirty-seven".