389668973 has 2 divisors, whose sum is σ = 389668974. Its totient is φ = 389668972.

The previous prime is 389668933. The next prime is 389668987. The reversal of 389668973 is 379866983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362597764 + 27071209 = 19042^2 + 5203^2 .

It is an emirp because it is prime and its reverse (379866983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389668973 - 2²⁸ = 121233517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389668913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194834486 + 194834487.

It is an arithmetic number, because the mean of its divisors is an integer number (194834487).

Almost surely, 2^389668973 is an apocalyptic number.

It is an amenable number.

389668973 is a deficient number, since it is larger than the sum of its proper divisors (1).

389668973 is an equidigital number, since it uses as much as digits as its factorization.

389668973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 59.

The square root of 389668973 is about 19740.0347770717. The cubic root of 389668973 is about 730.4075868606.

The spelling of 389668973 in words is "three hundred eighty-nine million, six hundred sixty-eight thousand, nine hundred seventy-three".