128157 has 4 divisors (see below), whose sum is σ = 170880. Its totient is φ = 85436.

The previous prime is 128153. The next prime is 128159. The reversal of 128157 is 751821.

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.

It is a cyclic number.

It is not a de Polignac number, because 128157 - 2² = 128153 is a prime.

It is an Ulam number.

It is a D-number.

128157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128153) 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, 21357 + ... + 21362.

It is an arithmetic number, because the mean of its divisors is an integer number (42720).

2¹²⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

128157 is a deficient number, since it is larger than the sum of its proper divisors (42723).

128157 is an equidigital number, since it uses as much as digits as its factorization.

128157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42722.

The product of its digits is 560, while the sum is 24.

The square root of 128157 is about 357.9902233302. The cubic root of 128157 is about 50.4174385359.

Adding to 128157 its reverse (751821), we get a palindrome (879978).

The spelling of 128157 in words is "one hundred twenty-eight thousand, one hundred fifty-seven".