128390 has 16 divisors (see below), whose sum is σ = 238032. Its totient is φ = 49824.

The previous prime is 128389. The next prime is 128393. The reversal of 128390 is 93821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128393) 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, 197 + ... + 543.

It is an arithmetic number, because the mean of its divisors is an integer number (14877).

2¹²⁸³⁹⁰ is an apocalyptic number.

128390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128390 is a deficient number, since it is larger than the sum of its proper divisors (109642).

128390 is a wasteful number, since it uses less digits than its factorization.

128390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 128390 is about 358.3155034324. The cubic root of 128390 is about 50.4479743922.

The spelling of 128390 in words is "one hundred twenty-eight thousand, three hundred ninety".