542540 has 12 divisors (see below), whose sum is σ = 1139376. Its totient is φ = 217008.

The previous prime is 542539. The next prime is 542551. The reversal of 542540 is 45245.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 27127 = 542540 / (5 + 4 + 2 + 5 + 4 + 0).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 542540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13544 + ... + 13583.

It is an arithmetic number, because the mean of its divisors is an integer number (94948).

2⁵⁴²⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

542540 is an abundant number, since it is smaller than the sum of its proper divisors (596836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

542540 is a wasteful number, since it uses less digits than its factorization.

542540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27136 (or 27134 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 542540 is about 736.5731464016. The cubic root of 542540 is about 81.5600069946.

Adding to 542540 its reverse (45245), we get a palindrome (587785).

The spelling of 542540 in words is "five hundred forty-two thousand, five hundred forty".