128418534 has 40 divisors (see below), whose sum is σ = 291721320. Its totient is φ = 42215904.

The previous prime is 128418517. The next prime is 128418539. The reversal of 128418534 is 435814821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128418539) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6397 + ... + 17255.

It is an arithmetic number, because the mean of its divisors is an integer number (7293033).

Almost surely, 2^128418534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128418534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145860660).

128418534 is an abundant number, since it is smaller than the sum of its proper divisors (163302786).

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

128418534 is a wasteful number, since it uses less digits than its factorization.

128418534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10946 (or 10937 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 128418534 is about 11332.1901678360. The cubic root of 128418534 is about 504.5171138075.

The spelling of 128418534 in words is "one hundred twenty-eight million, four hundred eighteen thousand, five hundred thirty-four".