305489 has 2 divisors, whose sum is σ = 305490. Its totient is φ = 305488.

The previous prime is 305483. The next prime is 305497. The reversal of 305489 is 984503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297025 + 8464 = 545^2 + 92^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-305489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (305483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152744 + 152745.

It is an arithmetic number, because the mean of its divisors is an integer number (152745).

2³⁰⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

305489 is a deficient number, since it is larger than the sum of its proper divisors (1).

305489 is an equidigital number, since it uses as much as digits as its factorization.

305489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 305489 is about 552.7105933488. The cubic root of 305489 is about 67.3491096800.

The spelling of 305489 in words is "three hundred five thousand, four hundred eighty-nine".