542786 has 4 divisors (see below), whose sum is σ = 814182. Its totient is φ = 271392.

The previous prime is 542783. The next prime is 542791. The reversal of 542786 is 687245.

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., 525625 + 17161 = 725^2 + 131^2 .

It is a d-powerful number, because it can be written as 5⁴ + 4² + 7² + 2⁴ + 8⁶ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (542783) 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 as a sum of consecutive naturals, namely, 135695 + ... + 135698.

2⁵⁴²⁷⁸⁶ is an apocalyptic number.

542786 is a deficient number, since it is larger than the sum of its proper divisors (271396).

542786 is a wasteful number, since it uses less digits than its factorization.

542786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271395.

The product of its digits is 13440, while the sum is 32.

The square root of 542786 is about 736.7401170019. The cubic root of 542786 is about 81.5723321872.

The spelling of 542786 in words is "five hundred forty-two thousand, seven hundred eighty-six".