542209 has 4 divisors (see below), whose sum is σ = 546480. Its totient is φ = 537940.

The previous prime is 542207. The next prime is 542219. The reversal of 542209 is 902245.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 542209 - 2¹ = 542207 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 542209.

It is not an unprimeable number, because it can be changed into a prime (542207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1939 + ... + 2200.

It is an arithmetic number, because the mean of its divisors is an integer number (136620).

2⁵⁴²²⁰⁹ is an apocalyptic number.

It is an amenable number.

542209 is a deficient number, since it is larger than the sum of its proper divisors (4271).

542209 is a wasteful number, since it uses less digits than its factorization.

542209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 542209 is about 736.3484229629. The cubic root of 542209 is about 81.5434172167.

The spelling of 542209 in words is "five hundred forty-two thousand, two hundred nine".