128338434 has 24 divisors (see below), whose sum is σ = 317790720. Its totient is φ = 36668088.

The previous prime is 128338421. The next prime is 128338471. The reversal of 128338434 is 434833821.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509154 + ... + 509405.

It is an arithmetic number, because the mean of its divisors is an integer number (13241280).

Almost surely, 2^128338434 is an apocalyptic number.

128338434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128338434 is an abundant number, since it is smaller than the sum of its proper divisors (189452286).

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

128338434 is a wasteful number, since it uses less digits than its factorization.

128338434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018574 (or 1018571 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 128338434 is about 11328.6554365467. The cubic root of 128338434 is about 504.4121958629.

The spelling of 128338434 in words is "one hundred twenty-eight million, three hundred thirty-eight thousand, four hundred thirty-four".