389666489 has 2 divisors, whose sum is σ = 389666490. Its totient is φ = 389666488.

The previous prime is 389666471. The next prime is 389666513. The reversal of 389666489 is 984666983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376670464 + 12996025 = 19408^2 + 3605^2 .

It is an emirp because it is prime and its reverse (984666983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389666489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (389666089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194833244 + 194833245.

It is an arithmetic number, because the mean of its divisors is an integer number (194833245).

Almost surely, 2^389666489 is an apocalyptic number.

It is an amenable number.

389666489 is a deficient number, since it is larger than the sum of its proper divisors (1).

389666489 is an equidigital number, since it uses as much as digits as its factorization.

389666489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 59.

The square root of 389666489 is about 19739.9718591491. The cubic root of 389666489 is about 730.4060348285.

The spelling of 389666489 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, four hundred eighty-nine".