128145 has 8 divisors (see below), whose sum is σ = 205056. Its totient is φ = 68336.

The previous prime is 128119. The next prime is 128147. The reversal of 128145 is 541821.

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

It is a cyclic number.

It is not a de Polignac number, because 128145 - 2⁵ = 128113 is a prime.

It is a super-2 number, since 2×128145² = 32842282050, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (128147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4257 + ... + 4286.

It is an arithmetic number, because the mean of its divisors is an integer number (25632).

2¹²⁸¹⁴⁵ is an apocalyptic number.

128145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128145 is a deficient number, since it is larger than the sum of its proper divisors (76911).

128145 is an equidigital number, since it uses as much as digits as its factorization.

128145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8551.

The product of its digits is 320, while the sum is 21.

The square root of 128145 is about 357.9734627036. The cubic root of 128145 is about 50.4158648720.

Adding to 128145 its reverse (541821), we get a palindrome (669966).

It can be divided in two parts, 1281 and 45, that added together give a triangular number (1326 = T₅₁).

The spelling of 128145 in words is "one hundred twenty-eight thousand, one hundred forty-five".