540289 has 4 divisors (see below), whose sum is σ = 542020. Its totient is φ = 538560.

The previous prime is 540283. The next prime is 540301. The reversal of 540289 is 982045.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 43264 = 705^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 540289 - 2¹⁷ = 409217 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 (540283) 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, 252 + ... + 1069.

It is an arithmetic number, because the mean of its divisors is an integer number (135505).

2⁵⁴⁰²⁸⁹ is an apocalyptic number.

It is an amenable number.

540289 is a deficient number, since it is larger than the sum of its proper divisors (1731).

540289 is a wasteful number, since it uses less digits than its factorization.

540289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 540289 is about 735.0435361256. The cubic root of 540289 is about 81.4470530680.

Adding to 540289 its product of nonzero digits (2880), we get a square (543169 = 737²).

The spelling of 540289 in words is "five hundred forty thousand, two hundred eighty-nine".