542009 has 8 divisors (see below), whose sum is σ = 589512. Its totient is φ = 495360.

The previous prime is 541999. The next prime is 542021. The reversal of 542009 is 900245.

It can be written as a sum of positive squares in 4 ways, for example, as 157609 + 384400 = 397^2 + 620^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 542009 - 2⁴ = 541993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (544009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129 + ... + 2369.

It is an arithmetic number, because the mean of its divisors is an integer number (73689).

2⁵⁴²⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

542009 is a deficient number, since it is larger than the sum of its proper divisors (47503).

542009 is a wasteful number, since it uses less digits than its factorization.

542009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 542009 is about 736.2126051624. The cubic root of 542009 is about 81.5333899092.

The spelling of 542009 in words is "five hundred forty-two thousand, nine".