420542 has 8 divisors (see below), whose sum is σ = 647976. Its totient is φ = 204552.

The previous prime is 420521. The next prime is 420551. The reversal of 420542 is 245024.

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

It is an Ulam number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 420542.

It is a congruent number.

It is an unprimeable number.

420542 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 in 3 ways as a sum of consecutive naturals, for example, 2768 + ... + 2915.

It is an arithmetic number, because the mean of its divisors is an integer number (80997).

2⁴²⁰⁵⁴² is an apocalyptic number.

420542 is a deficient number, since it is larger than the sum of its proper divisors (227434).

420542 is a wasteful number, since it uses less digits than its factorization.

420542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 420542 is about 648.4920970991. The cubic root of 420542 is about 74.9209240633.

Adding to 420542 its reverse (245024), we get a palindrome (665566).

The spelling of 420542 in words is "four hundred twenty thousand, five hundred forty-two".