128912 has 20 divisors (see below), whose sum is σ = 285696. Its totient is φ = 55200.

The previous prime is 128903. The next prime is 128923. The reversal of 128912 is 219821.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

128912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 687.

2¹²⁸⁹¹² is an apocalyptic number.

It is an amenable number.

128912 is an abundant number, since it is smaller than the sum of its proper divisors (156784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128912 is a wasteful number, since it uses less digits than its factorization.

128912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1160 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 128912 is about 359.0431728915. The cubic root of 128912 is about 50.5162513458.

Subtracting 128912 from its reverse (219821), we obtain a palindrome (90909).

The spelling of 128912 in words is "one hundred twenty-eight thousand, nine hundred twelve".