542305 has 4 divisors (see below), whose sum is σ = 650772. Its totient is φ = 433840.

The previous prime is 542299. The next prime is 542323. The reversal of 542305 is 503245.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503245 = 5 ⋅100649.

It can be written as a sum of positive squares in 2 ways, for example, as 121104 + 421201 = 348^2 + 649^2 .

It is not a de Polignac number, because 542305 - 2¹³ = 534113 is a prime.

It is a Duffinian number.

542305 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54226 + ... + 54235.

It is an arithmetic number, because the mean of its divisors is an integer number (162693).

2⁵⁴²³⁰⁵ is an apocalyptic number.

It is an amenable number.

542305 is a deficient number, since it is larger than the sum of its proper divisors (108467).

542305 is a wasteful number, since it uses less digits than its factorization.

542305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108466.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 542305 is about 736.4136066098. The cubic root of 542305 is about 81.5482294484.

Subtracting from 542305 its reverse (503245), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 542305 in words is "five hundred forty-two thousand, three hundred five".