518542 has 4 divisors (see below), whose sum is σ = 777816. Its totient is φ = 259270.

The previous prime is 518533. The next prime is 518543. The reversal of 518542 is 245815.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518543) by changing a digit.

518542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129634 + ... + 129637.

It is an arithmetic number, because the mean of its divisors is an integer number (194454).

2⁵¹⁸⁵⁴² is an apocalyptic number.

518542 is a deficient number, since it is larger than the sum of its proper divisors (259274).

518542 is a wasteful number, since it uses less digits than its factorization.

518542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259273.

The product of its digits is 1600, while the sum is 25.

The square root of 518542 is about 720.0986043592. The cubic root of 518542 is about 80.3392881766.

The spelling of 518542 in words is "five hundred eighteen thousand, five hundred forty-two".