12128894 has 4 divisors (see below), whose sum is σ = 18193344. Its totient is φ = 6064446.

The previous prime is 12128887. The next prime is 12128903. The reversal of 12128894 is 49882121.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×12128894² = 294220139326472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3032222 + ... + 3032225.

It is an arithmetic number, because the mean of its divisors is an integer number (4548336).

Almost surely, 2^12128894 is an apocalyptic number.

12128894 is a deficient number, since it is larger than the sum of its proper divisors (6064450).

12128894 is an equidigital number, since it uses as much as digits as its factorization.

12128894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064449.

The product of its digits is 9216, while the sum is 35.

The square root of 12128894 is about 3482.6561702241. The cubic root of 12128894 is about 229.7596354698.

The spelling of 12128894 in words is "twelve million, one hundred twenty-eight thousand, eight hundred ninety-four".