428809439 has 2 divisors, whose sum is σ = 428809440. Its totient is φ = 428809438.

The previous prime is 428809429. The next prime is 428809441. The reversal of 428809439 is 934908824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428809439 - 2¹² = 428805343 is a prime.

Together with 428809441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 428809393 and 428809402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428809429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214404719 + 214404720.

It is an arithmetic number, because the mean of its divisors is an integer number (214404720).

Almost surely, 2^428809439 is an apocalyptic number.

428809439 is a deficient number, since it is larger than the sum of its proper divisors (1).

428809439 is an equidigital number, since it uses as much as digits as its factorization.

428809439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 428809439 is about 20707.7144803573. The cubic root of 428809439 is about 754.0869854639.

The spelling of 428809439 in words is "four hundred twenty-eight million, eight hundred nine thousand, four hundred thirty-nine".