12428131 has 4 divisors (see below), whose sum is σ = 12441664. Its totient is φ = 12414600.

The previous prime is 12428113. The next prime is 12428137. The reversal of 12428131 is 13182421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12428131 - 2¹⁷ = 12297059 is a prime.

It is a super-2 number, since 2×12428131² = 308916880306322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12428137) 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, 5280 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (3110416).

Almost surely, 2^12428131 is an apocalyptic number.

12428131 is a deficient number, since it is larger than the sum of its proper divisors (13533).

12428131 is an equidigital number, since it uses as much as digits as its factorization.

12428131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532.

The product of its digits is 384, while the sum is 22.

The square root of 12428131 is about 3525.3554430724. The cubic root of 12428131 is about 231.6338047229.

The spelling of 12428131 in words is "twelve million, four hundred twenty-eight thousand, one hundred thirty-one".