540205642 has 4 divisors (see below), whose sum is σ = 810308466. Its totient is φ = 270102820.

The previous prime is 540205579. The next prime is 540205643. The reversal of 540205642 is 246502045.

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

It can be written as a sum of positive squares in only one way, i.e., 539121961 + 1083681 = 23219^2 + 1041^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 540205642.

It is not an unprimeable number, because it can be changed into a prime (540205643) by changing a digit.

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 as a sum of consecutive naturals, namely, 135051409 + ... + 135051412.

Almost surely, 2^540205642 is an apocalyptic number.

540205642 is a deficient number, since it is larger than the sum of its proper divisors (270102824).

540205642 is a wasteful number, since it uses less digits than its factorization.

540205642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270102823.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 540205642 is about 23242.3243674121. The cubic root of 540205642 is about 814.4286419090.

Adding to 540205642 its reverse (246502045), we get a palindrome (786707687).

The spelling of 540205642 in words is "five hundred forty million, two hundred five thousand, six hundred forty-two".