289864427 has 2 divisors, whose sum is σ = 289864428. Its totient is φ = 289864426.

The previous prime is 289864417. The next prime is 289864429. The reversal of 289864427 is 724468982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 289864427 - 2¹⁸ = 289602283 is a prime.

Together with 289864429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (289864429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144932213 + 144932214.

It is an arithmetic number, because the mean of its divisors is an integer number (144932214).

Almost surely, 2^289864427 is an apocalyptic number.

289864427 is a deficient number, since it is larger than the sum of its proper divisors (1).

289864427 is an equidigital number, since it uses as much as digits as its factorization.

289864427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 50.

The square root of 289864427 is about 17025.4053402555. The cubic root of 289864427 is about 661.8074325123.

The spelling of 289864427 in words is "two hundred eighty-nine million, eight hundred sixty-four thousand, four hundred twenty-seven".