420534 has 24 divisors (see below), whose sum is σ = 928512. Its totient is φ = 137520.

The previous prime is 420521. The next prime is 420551. The reversal of 420534 is 435024.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

420534 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 907 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (38688).

2⁴²⁰⁵³⁴ is an apocalyptic number.

420534 is an abundant number, since it is smaller than the sum of its proper divisors (507978).

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

420534 is a wasteful number, since it uses less digits than its factorization.

420534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 420534 is about 648.4859289144. The cubic root of 420534 is about 74.9204489850.

Adding to 420534 its reverse (435024), we get a palindrome (855558).

The spelling of 420534 in words is "four hundred twenty thousand, five hundred thirty-four".