542909 has 8 divisors (see below), whose sum is σ = 570360. Its totient is φ = 516096.

The previous prime is 542891. The next prime is 542911. The reversal of 542909 is 909245.

It can be written as a sum of positive squares in 4 ways, for example, as 31684 + 511225 = 178^2 + 715^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a plaindrome in base 12 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542939) 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, 2717 + ... + 2909.

It is an arithmetic number, because the mean of its divisors is an integer number (71295).

2⁵⁴²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

542909 is a deficient number, since it is larger than the sum of its proper divisors (27451).

542909 is a wasteful number, since it uses less digits than its factorization.

542909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 542909 is about 736.8235881132. The cubic root of 542909 is about 81.5784933870.

542909 divided by its sum of digits (29) gives a triangular number (18721 = T₁₉₃).

The spelling of 542909 in words is "five hundred forty-two thousand, nine hundred nine".