128393534 has 4 divisors (see below), whose sum is σ = 192590304. Its totient is φ = 64196766.

The previous prime is 128393491. The next prime is 128393543. The reversal of 128393534 is 435393821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 435393821 = 1297 ⋅335693.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32098382 + ... + 32098385.

It is an arithmetic number, because the mean of its divisors is an integer number (48147576).

Almost surely, 2^128393534 is an apocalyptic number.

128393534 is a deficient number, since it is larger than the sum of its proper divisors (64196770).

128393534 is an equidigital number, since it uses as much as digits as its factorization.

128393534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64196769.

The product of its digits is 77760, while the sum is 38.

The square root of 128393534 is about 11331.0870617077. The cubic root of 128393534 is about 504.4843725668.

The spelling of 128393534 in words is "one hundred twenty-eight million, three hundred ninety-three thousand, five hundred thirty-four".