289857493 has 2 divisors, whose sum is σ = 289857494. Its totient is φ = 289857492.

The previous prime is 289857479. The next prime is 289857511. The reversal of 289857493 is 394758982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288422289 + 1435204 = 16983^2 + 1198^2 .

It is a cyclic number.

It is not a de Polignac number, because 289857493 - 2⁵ = 289857461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289857433) 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, 144928746 + 144928747.

It is an arithmetic number, because the mean of its divisors is an integer number (144928747).

Almost surely, 2^289857493 is an apocalyptic number.

It is an amenable number.

289857493 is a deficient number, since it is larger than the sum of its proper divisors (1).

289857493 is an equidigital number, since it uses as much as digits as its factorization.

289857493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 55.

The square root of 289857493 is about 17025.2017021826. The cubic root of 289857493 is about 661.8021553219.

The spelling of 289857493 in words is "two hundred eighty-nine million, eight hundred fifty-seven thousand, four hundred ninety-three".