289399821865 has 48 divisors (see below), whose sum is σ = 436372957440. Its totient is φ = 180355190400.

The previous prime is 289399821853. The next prime is 289399821899. The reversal of 289399821865 is 568128993982.

It is not a de Polignac number, because 289399821865 - 2³³ = 280809887273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 289399821794 and 289399821803.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 20621671 + ... + 20635699.

It is an arithmetic number, because the mean of its divisors is an integer number (9091103280).

Almost surely, 2^289399821865 is an apocalyptic number.

It is an amenable number.

289399821865 is a deficient number, since it is larger than the sum of its proper divisors (146973135575).

289399821865 is a wasteful number, since it uses less digits than its factorization.

289399821865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18934 (or 18923 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 70.

The spelling of 289399821865 in words is "two hundred eighty-nine billion, three hundred ninety-nine million, eight hundred twenty-one thousand, eight hundred sixty-five".