128239000 has 32 divisors (see below), whose sum is σ = 300081600. Its totient is φ = 51295200.

The previous prime is 128238997. The next prime is 128239009. The reversal of 128239000 is 932821.

It is a super-2 number, since 2×128239000² = 32890482242000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128239009) 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 7 ways as a sum of consecutive naturals, for example, 63120 + ... + 65119.

It is an arithmetic number, because the mean of its divisors is an integer number (9377550).

Almost surely, 2^128239000 is an apocalyptic number.

128239000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128239000 is an abundant number, since it is smaller than the sum of its proper divisors (171842600).

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

128239000 is a wasteful number, since it uses less digits than its factorization.

128239000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128260 (or 128246 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 128239000 is about 11324.2659806276. The cubic root of 128239000 is about 504.2818927794.

The spelling of 128239000 in words is "one hundred twenty-eight million, two hundred thirty-nine thousand".