289212885 has 24 divisors (see below), whose sum is σ = 539865144. Its totient is φ = 142381440.

The previous prime is 289212877. The next prime is 289212901. The reversal of 289212885 is 588212982.

It can be written as a sum of positive squares in 4 ways, for example, as 30935844 + 258277041 = 5562^2 + 16071^2 .

It is not a de Polignac number, because 289212885 - 2³ = 289212877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 289212885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 246606 + ... + 247775.

It is an arithmetic number, because the mean of its divisors is an integer number (22494381).

Almost surely, 2^289212885 is an apocalyptic number.

It is an amenable number.

289212885 is a deficient number, since it is larger than the sum of its proper divisors (250652259).

289212885 is a wasteful number, since it uses less digits than its factorization.

289212885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494405 (or 494402 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 289212885 is about 17006.2601708900. The cubic root of 289212885 is about 661.3112018901.

The spelling of 289212885 in words is "two hundred eighty-nine million, two hundred twelve thousand, eight hundred eighty-five".