428324389 has 2 divisors, whose sum is σ = 428324390. Its totient is φ = 428324388.

The previous prime is 428324357. The next prime is 428324441. The reversal of 428324389 is 983423824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232044289 + 196280100 = 15233^2 + 14010^2 .

It is a cyclic number.

It is not a de Polignac number, because 428324389 - 2⁵ = 428324357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428324339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214162194 + 214162195.

It is an arithmetic number, because the mean of its divisors is an integer number (214162195).

Almost surely, 2^428324389 is an apocalyptic number.

It is an amenable number.

428324389 is a deficient number, since it is larger than the sum of its proper divisors (1).

428324389 is an equidigital number, since it uses as much as digits as its factorization.

428324389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 43.

The square root of 428324389 is about 20695.9993477000. Note that the first 3 decimals coincide. The cubic root of 428324389 is about 753.8025484002.

The spelling of 428324389 in words is "four hundred twenty-eight million, three hundred twenty-four thousand, three hundred eighty-nine".