128408434 has 16 divisors (see below), whose sum is σ = 240140736. Its totient is φ = 50029200.

The previous prime is 128408419. The next prime is 128408443. The reversal of 128408434 is 434804821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128408434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416757 + ... + 417064.

It is an arithmetic number, because the mean of its divisors is an integer number (15008796).

Almost surely, 2^128408434 is an apocalyptic number.

128408434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128408434 is a deficient number, since it is larger than the sum of its proper divisors (111732302).

128408434 is a wasteful number, since it uses less digits than its factorization.

128408434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833841.

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 128408434 is about 11331.7445258883. The cubic root of 128408434 is about 504.5038868579.

The spelling of 128408434 in words is "one hundred twenty-eight million, four hundred eight thousand, four hundred thirty-four".