542309 has 4 divisors (see below), whose sum is σ = 557004. Its totient is φ = 527616.

The previous prime is 542299. The next prime is 542323. The reversal of 542309 is 903245.

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 521284 + 21025 = 722^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 542309 - 2⁴ = 542293 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 (541309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7292 + ... + 7365.

It is an arithmetic number, because the mean of its divisors is an integer number (139251).

2⁵⁴²³⁰⁹ is an apocalyptic number.

It is an amenable number.

542309 is a deficient number, since it is larger than the sum of its proper divisors (14695).

542309 is a wasteful number, since it uses less digits than its factorization.

542309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14694.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 542309 is about 736.4163224698. The cubic root of 542309 is about 81.5484299458.

The spelling of 542309 in words is "five hundred forty-two thousand, three hundred nine".