289386321 has 32 divisors (see below), whose sum is σ = 465269760. Its totient is φ = 156292416.

The previous prime is 289386319. The next prime is 289386329. The reversal of 289386321 is 123683982.

It is not a de Polignac number, because 289386321 - 2¹ = 289386319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289386329) 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 in 31 ways as a sum of consecutive naturals, for example, 329535 + ... + 330411.

It is an arithmetic number, because the mean of its divisors is an integer number (14539680).

Almost surely, 2^289386321 is an apocalyptic number.

289386321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

289386321 is a deficient number, since it is larger than the sum of its proper divisors (175883439).

289386321 is a wasteful number, since it uses less digits than its factorization.

289386321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733.

The product of its digits is 124416, while the sum is 42.

The square root of 289386321 is about 17011.3585877201. The cubic root of 289386321 is about 661.4433677977.

The spelling of 289386321 in words is "two hundred eighty-nine million, three hundred eighty-six thousand, three hundred twenty-one".