289870225 has 24 divisors (see below), whose sum is σ = 376995960. Its totient is φ = 220792320.

The previous prime is 289870223. The next prime is 289870237. The reversal of 289870225 is 522078982.

It can be written as a sum of positive squares in 12 ways, for example, as 3448449 + 286421776 = 1857^2 + 16924^2 .

It is not a de Polignac number, because 289870225 - 2¹ = 289870223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (289870223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50187 + ... + 55663.

It is an arithmetic number, because the mean of its divisors is an integer number (15708165).

Almost surely, 2^289870225 is an apocalyptic number.

289870225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

289870225 is a deficient number, since it is larger than the sum of its proper divisors (87125735).

289870225 is a wasteful number, since it uses less digits than its factorization.

289870225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589 (or 5584 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 289870225 is about 17025.5756143515. The cubic root of 289870225 is about 661.8118450739.

The spelling of 289870225 in words is "two hundred eighty-nine million, eight hundred seventy thousand, two hundred twenty-five".