428809417 has 2 divisors, whose sum is σ = 428809418. Its totient is φ = 428809416.

The previous prime is 428809397. The next prime is 428809421. The reversal of 428809417 is 714908824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412455481 + 16353936 = 20309^2 + 4044^2 .

It is a cyclic number.

It is not a de Polignac number, because 428809417 - 2⁷ = 428809289 is a prime.

It is a super-2 number, since 2×428809417² = 367755032215759778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (428809427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214404708 + 214404709.

It is an arithmetic number, because the mean of its divisors is an integer number (214404709).

Almost surely, 2^428809417 is an apocalyptic number.

It is an amenable number.

428809417 is a deficient number, since it is larger than the sum of its proper divisors (1).

428809417 is an equidigital number, since it uses as much as digits as its factorization.

428809417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 428809417 is about 20707.7139491543. The cubic root of 428809417 is about 754.0869725678.

The spelling of 428809417 in words is "four hundred twenty-eight million, eight hundred nine thousand, four hundred seventeen".