540445 has 4 divisors (see below), whose sum is σ = 648540. Its totient is φ = 432352.

The previous prime is 540437. The next prime is 540461. The reversal of 540445 is 544045.

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 251001 + 289444 = 501^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 540445 - 2³ = 540437 is a prime.

540445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54040 + ... + 54049.

It is an arithmetic number, because the mean of its divisors is an integer number (162135).

2⁵⁴⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

540445 is a deficient number, since it is larger than the sum of its proper divisors (108095).

540445 is a wasteful number, since it uses less digits than its factorization.

540445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108094.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 540445 is about 735.1496446303. The cubic root of 540445 is about 81.4548911680.

Subtracting 540445 from its reverse (544045), we obtain a square (3600 = 60²).

The spelling of 540445 in words is "five hundred forty thousand, four hundred forty-five".