540817 has 4 divisors (see below), whose sum is σ = 542500. Its totient is φ = 539136.

The previous prime is 540809. The next prime is 540823. The reversal of 540817 is 718045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718045 = 5 ⋅143609.

It can be written as a sum of positive squares in 2 ways, for example, as 132496 + 408321 = 364^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 540817 - 2³ = 540809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 540791 and 540800.

It is not an unprimeable number, because it can be changed into a prime (540877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (135625).

2⁵⁴⁰⁸¹⁷ is an apocalyptic number.

It is an amenable number.

540817 is a deficient number, since it is larger than the sum of its proper divisors (1683).

540817 is a wasteful number, since it uses less digits than its factorization.

540817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 540817 is about 735.4026108194. The cubic root of 540817 is about 81.4735759369.

The spelling of 540817 in words is "five hundred forty thousand, eight hundred seventeen".