128925 has 24 divisors (see below), whose sum is σ = 238080. Its totient is φ = 68400.

The previous prime is 128923. The next prime is 128939. The reversal of 128925 is 529821.

It is not a de Polignac number, because 128925 - 2¹ = 128923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 580 + ... + 770.

It is an arithmetic number, because the mean of its divisors is an integer number (9920).

2¹²⁸⁹²⁵ is an apocalyptic number.

128925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128925 is a deficient number, since it is larger than the sum of its proper divisors (109155).

128925 is a wasteful number, since it uses less digits than its factorization.

128925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 199 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 128925 is about 359.0612761076. The cubic root of 128925 is about 50.5179493754.

The spelling of 128925 in words is "one hundred twenty-eight thousand, nine hundred twenty-five".