428212243 has 2 divisors, whose sum is σ = 428212244. Its totient is φ = 428212242.

The previous prime is 428212171. The next prime is 428212283. The reversal of 428212243 is 342212824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428212243 is a prime.

It is not a weakly prime, because it can be changed into another prime (428212283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214106121 + 214106122.

It is an arithmetic number, because the mean of its divisors is an integer number (214106122).

Almost surely, 2^428212243 is an apocalyptic number.

428212243 is a deficient number, since it is larger than the sum of its proper divisors (1).

428212243 is an equidigital number, since it uses as much as digits as its factorization.

428212243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 28.

The square root of 428212243 is about 20693.2898061183. The cubic root of 428212243 is about 753.7367545597.

The spelling of 428212243 in words is "four hundred twenty-eight million, two hundred twelve thousand, two hundred forty-three".