Search a number
BaseRepresentation
bin111011010110101
31112200112
413122311
51433024
6352405
7154412
oct73265
945615
1030389
1120917
1215705
1310aa8
14b109
15900e
hex76b5

30389 has 2 divisors, whose sum is σ = 30390. Its totient is φ = 30388.

The previous prime is 30367. The next prime is 30391. The reversal of 30389 is 98303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27889 + 2500 = 167^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 30389 - 28 = 30133 is a prime.

It is a Sophie Germain prime.

Together with 30391, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15194 + 15195.

It is an arithmetic number, because the mean of its divisors is an integer number (15195).

230389 is an apocalyptic number.

It is an amenable number.

30389 is a deficient number, since it is larger than the sum of its proper divisors (1).

30389 is an equidigital number, since it uses as much as digits as its factorization.

30389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 30389 is about 174.3244102242. The cubic root of 30389 is about 31.2060502183.

The spelling of 30389 in words is "thirty thousand, three hundred eighty-nine".