128838542 has 24 divisors (see below), whose sum is σ = 232067520. Its totient is φ = 53434080.

The previous prime is 128838539. The next prime is 128838557. The reversal of 128838542 is 245838821.

It is a self number, because there is not a number n which added to its sum of digits gives 128838542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18167 + ... + 24242.

It is an arithmetic number, because the mean of its divisors is an integer number (9669480).

Almost surely, 2^128838542 is an apocalyptic number.

128838542 is a deficient number, since it is larger than the sum of its proper divisors (103228978).

128838542 is a wasteful number, since it uses less digits than its factorization.

128838542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42456 (or 42449 counting only the distinct ones).

The product of its digits is 122880, while the sum is 41.

The square root of 128838542 is about 11350.7066740358. The cubic root of 128838542 is about 505.0665428767.

The spelling of 128838542 in words is "one hundred twenty-eight million, eight hundred thirty-eight thousand, five hundred forty-two".