542765 has 4 divisors (see below), whose sum is σ = 651324. Its totient is φ = 434208.

The previous prime is 542761. The next prime is 542771. The reversal of 542765 is 567245.

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

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 293764 = 499^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 542765 - 2² = 542761 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 (542761) by changing a digit.

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, 54272 + ... + 54281.

It is an arithmetic number, because the mean of its divisors is an integer number (162831).

2⁵⁴²⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

542765 is a deficient number, since it is larger than the sum of its proper divisors (108559).

542765 is a wasteful number, since it uses less digits than its factorization.

542765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108558.

The product of its digits is 8400, while the sum is 29.

The square root of 542765 is about 736.7258648914. The cubic root of 542765 is about 81.5712801820.

The spelling of 542765 in words is "five hundred forty-two thousand, seven hundred sixty-five".