289840873 has 4 divisors (see below), whose sum is σ = 331246720. Its totient is φ = 248435028.

The previous prime is 289840843. The next prime is 289840891. The reversal of 289840873 is 378048982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 289840873 - 2⁵ = 289840841 is a prime.

It is a super-2 number, since 2×289840873² = 168015463322804258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (289840813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20702913 + ... + 20702926.

It is an arithmetic number, because the mean of its divisors is an integer number (82811680).

Almost surely, 2^289840873 is an apocalyptic number.

It is an amenable number.

289840873 is a deficient number, since it is larger than the sum of its proper divisors (41405847).

289840873 is an equidigital number, since it uses as much as digits as its factorization.

289840873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41405846.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 289840873 is about 17024.7135952415. The cubic root of 289840873 is about 661.7895061612.

The spelling of 289840873 in words is "two hundred eighty-nine million, eight hundred forty thousand, eight hundred seventy-three".