542506 has 4 divisors (see below), whose sum is σ = 813762. Its totient is φ = 271252.

The previous prime is 542497. The next prime is 542519. The reversal of 542506 is 605245.

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., 477481 + 65025 = 691^2 + 255^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

542506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135625 + ... + 135628.

2⁵⁴²⁵⁰⁶ is an apocalyptic number.

542506 is a deficient number, since it is larger than the sum of its proper divisors (271256).

542506 is a wasteful number, since it uses less digits than its factorization.

542506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271255.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 542506 is about 736.5500661869. The cubic root of 542506 is about 81.5583032196.

The spelling of 542506 in words is "five hundred forty-two thousand, five hundred six".