289824021 has 16 divisors (see below), whose sum is σ = 429632320. Its totient is φ = 193097520.

The previous prime is 289824019. The next prime is 289824037. The reversal of 289824021 is 120428982.

It is not a de Polignac number, because 289824021 - 2¹ = 289824019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289824011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78411 + ... + 82023.

It is an arithmetic number, because the mean of its divisors is an integer number (26852020).

Almost surely, 2^289824021 is an apocalyptic number.

It is an amenable number.

289824021 is a deficient number, since it is larger than the sum of its proper divisors (139808299).

289824021 is a wasteful number, since it uses less digits than its factorization.

289824021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6593 (or 6587 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 289824021 is about 17024.2186604848. The cubic root of 289824021 is about 661.7766799360.

The spelling of 289824021 in words is "two hundred eighty-nine million, eight hundred twenty-four thousand, twenty-one".