12128838 has 32 divisors (see below), whose sum is σ = 25318656. Its totient is φ = 3870048.

The previous prime is 12128827. The next prime is 12128869. The reversal of 12128838 is 83882121.

It is a super-2 number, since 2×12128838² = 294217422460488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12128799 and 12128808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13231 + ... + 14117.

It is an arithmetic number, because the mean of its divisors is an integer number (791208).

Almost surely, 2^12128838 is an apocalyptic number.

12128838 is an abundant number, since it is smaller than the sum of its proper divisors (13189818).

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

12128838 is a wasteful number, since it uses less digits than its factorization.

12128838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988.

The product of its digits is 6144, while the sum is 33.

The square root of 12128838 is about 3482.6481303744. The cubic root of 12128838 is about 229.7592818636.

The spelling of 12128838 in words is "twelve million, one hundred twenty-eight thousand, eight hundred thirty-eight".