12428861 has 4 divisors (see below), whose sum is σ = 12829824. Its totient is φ = 12027900.

The previous prime is 12428837. The next prime is 12428891. The reversal of 12428861 is 16882421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12428861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200435 + ... + 200496.

It is an arithmetic number, because the mean of its divisors is an integer number (3207456).

Almost surely, 2^12428861 is an apocalyptic number.

It is an amenable number.

12428861 is a deficient number, since it is larger than the sum of its proper divisors (400963).

12428861 is an equidigital number, since it uses as much as digits as its factorization.

12428861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400962.

The product of its digits is 6144, while the sum is 32.

The square root of 12428861 is about 3525.4589772113. The cubic root of 12428861 is about 231.6383398475.

The spelling of 12428861 in words is "twelve million, four hundred twenty-eight thousand, eight hundred sixty-one".