289520405 has 4 divisors (see below), whose sum is σ = 347424492. Its totient is φ = 231616320.

The previous prime is 289520383. The next prime is 289520417. The reversal of 289520405 is 504025982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504025982 = 2 ⋅252012991.

It can be written as a sum of positive squares in 2 ways, for example, as 172318129 + 117202276 = 13127^2 + 10826^2 .

It is not a de Polignac number, because 289520405 - 2¹⁰ = 289519381 is a prime.

It is a super-2 number, since 2×289520405² = 167644129822728050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 28952036 + ... + 28952045.

It is an arithmetic number, because the mean of its divisors is an integer number (86856123).

Almost surely, 2^289520405 is an apocalyptic number.

It is an amenable number.

289520405 is a deficient number, since it is larger than the sum of its proper divisors (57904087).

289520405 is an equidigital number, since it uses as much as digits as its factorization.

289520405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57904086.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 289520405 is about 17015.2991451811. The cubic root of 289520405 is about 661.5455095507.

The spelling of 289520405 in words is "two hundred eighty-nine million, five hundred twenty thousand, four hundred five".