984657389 has 2 divisors, whose sum is σ = 984657390. Its totient is φ = 984657388.

The previous prime is 984657367. The next prime is 984657403. The reversal of 984657389 is 983756489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505485289 + 479172100 = 22483^2 + 21890^2 .

It is an emirp because it is prime and its reverse (983756489) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 984657389 - 2⁸ = 984657133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (984657589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492328694 + 492328695.

It is an arithmetic number, because the mean of its divisors is an integer number (492328695).

Almost surely, 2^984657389 is an apocalyptic number.

It is an amenable number.

984657389 is a deficient number, since it is larger than the sum of its proper divisors (1).

984657389 is an equidigital number, since it uses as much as digits as its factorization.

984657389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 59.

The square root of 984657389 is about 31379.2509311488. The cubic root of 984657389 is about 994.8594160106.

The spelling of 984657389 in words is "nine hundred eighty-four million, six hundred fifty-seven thousand, three hundred eighty-nine".