12428909 has 2 divisors, whose sum is σ = 12428910. Its totient is φ = 12428908.

The previous prime is 12428903. The next prime is 12428951. The reversal of 12428909 is 90982421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10530025 + 1898884 = 3245^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 12428909 - 2¹² = 12424813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12428903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6214454 + 6214455.

It is an arithmetic number, because the mean of its divisors is an integer number (6214455).

Almost surely, 2^12428909 is an apocalyptic number.

It is an amenable number.

12428909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12428909 is an equidigital number, since it uses as much as digits as its factorization.

12428909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 12428909 is about 3525.4657848290. The cubic root of 12428909 is about 231.6386380412.

The spelling of 12428909 in words is "twelve million, four hundred twenty-eight thousand, nine hundred nine".