128000439 has 32 divisors (see below), whose sum is σ = 217763840. Its totient is φ = 72791136.

The previous prime is 128000437. The next prime is 128000491. The reversal of 128000439 is 934000821.

It is not a de Polignac number, because 128000439 - 2¹ = 128000437 is a prime.

It is a super-2 number, since 2×128000439² = 32768224768385442, which contains 22 as substring.

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 (128000437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40629 + ... + 43665.

It is an arithmetic number, because the mean of its divisors is an integer number (6805120).

Almost surely, 2^128000439 is an apocalyptic number.

128000439 is a deficient number, since it is larger than the sum of its proper divisors (89763401).

128000439 is a wasteful number, since it uses less digits than its factorization.

128000439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276 (or 3270 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 128000439 is about 11313.7279002104. The cubic root of 128000439 is about 503.9689961087.

The spelling of 128000439 in words is "one hundred twenty-eight million, four hundred thirty-nine", and thus it is an aban number.