542647 has 4 divisors (see below), whose sum is σ = 620176. Its totient is φ = 465120.

The previous prime is 542603. The next prime is 542683. The reversal of 542647 is 746245.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746245 = 5 ⋅149249.

It is a cyclic number.

It is not a de Polignac number, because 542647 - 2⁷ = 542519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542687) 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 in 3 ways as a sum of consecutive naturals, for example, 38754 + ... + 38767.

It is an arithmetic number, because the mean of its divisors is an integer number (155044).

2⁵⁴²⁶⁴⁷ is an apocalyptic number.

542647 is a deficient number, since it is larger than the sum of its proper divisors (77529).

542647 is an equidigital number, since it uses as much as digits as its factorization.

542647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77528.

The product of its digits is 6720, while the sum is 28.

The square root of 542647 is about 736.6457764760. The cubic root of 542647 is about 81.5653684101.

It can be divided in two parts, 54 and 2647, that added together give a triangular number (2701 = T₇₃).

The spelling of 542647 in words is "five hundred forty-two thousand, six hundred forty-seven".