428093489 has 2 divisors, whose sum is σ = 428093490. Its totient is φ = 428093488.

The previous prime is 428093483. The next prime is 428093513. The reversal of 428093489 is 984390824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357399025 + 70694464 = 18905^2 + 8408^2 .

It is a cyclic number.

It is not a de Polignac number, because 428093489 - 2⁸ = 428093233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (428093483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214046744 + 214046745.

It is an arithmetic number, because the mean of its divisors is an integer number (214046745).

Almost surely, 2^428093489 is an apocalyptic number.

It is an amenable number.

428093489 is a deficient number, since it is larger than the sum of its proper divisors (1).

428093489 is an equidigital number, since it uses as much as digits as its factorization.

428093489 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 428093489 is about 20690.4202228954. The cubic root of 428093489 is about 753.6670714126.

The spelling of 428093489 in words is "four hundred twenty-eight million, ninety-three thousand, four hundred eighty-nine".