289680397 has 2 divisors, whose sum is σ = 289680398. Its totient is φ = 289680396.

The previous prime is 289680389. The next prime is 289680401. The reversal of 289680397 is 793086982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210221001 + 79459396 = 14499^2 + 8914^2 .

It is a cyclic number.

It is not a de Polignac number, because 289680397 - 2³ = 289680389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289680997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144840198 + 144840199.

It is an arithmetic number, because the mean of its divisors is an integer number (144840199).

Almost surely, 2^289680397 is an apocalyptic number.

It is an amenable number.

289680397 is a deficient number, since it is larger than the sum of its proper divisors (1).

289680397 is an equidigital number, since it uses as much as digits as its factorization.

289680397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 289680397 is about 17019.9999118684. Note that the first 4 decimals coincide. The cubic root of 289680397 is about 661.6673460970.

The spelling of 289680397 in words is "two hundred eighty-nine million, six hundred eighty thousand, three hundred ninety-seven".