308428489 has 2 divisors, whose sum is σ = 308428490. Its totient is φ = 308428488.

The previous prime is 308428487. The next prime is 308428493. The reversal of 308428489 is 984824803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214183225 + 94245264 = 14635^2 + 9708^2 .

It is a cyclic number.

It is not a de Polignac number, because 308428489 - 2¹ = 308428487 is a prime.

Together with 308428487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (308428481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154214244 + 154214245.

It is an arithmetic number, because the mean of its divisors is an integer number (154214245).

Almost surely, 2^308428489 is an apocalyptic number.

It is an amenable number.

308428489 is a deficient number, since it is larger than the sum of its proper divisors (1).

308428489 is an equidigital number, since it uses as much as digits as its factorization.

308428489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 308428489 is about 17562.1322452600. The cubic root of 308428489 is about 675.6443697685.

The spelling of 308428489 in words is "three hundred eight million, four hundred twenty-eight thousand, four hundred eighty-nine".