428354989 has 2 divisors, whose sum is σ = 428354990. Its totient is φ = 428354988.

The previous prime is 428354987. The next prime is 428355071. The reversal of 428354989 is 989453824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411684100 + 16670889 = 20290^2 + 4083^2 .

It is a cyclic number.

It is not a de Polignac number, because 428354989 - 2¹ = 428354987 is a prime.

Together with 428354987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428354987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214177494 + 214177495.

It is an arithmetic number, because the mean of its divisors is an integer number (214177495).

Almost surely, 2^428354989 is an apocalyptic number.

It is an amenable number.

428354989 is a deficient number, since it is larger than the sum of its proper divisors (1).

428354989 is an equidigital number, since it uses as much as digits as its factorization.

428354989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The square root of 428354989 is about 20696.7386078097. The cubic root of 428354989 is about 753.8204988207.

The spelling of 428354989 in words is "four hundred twenty-eight million, three hundred fifty-four thousand, nine hundred eighty-nine".