420550 has 24 divisors (see below), whose sum is σ = 843696. Its totient is φ = 155040.

The previous prime is 420521. The next prime is 420551. The reversal of 420550 is 55024.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420551) by changing a digit.

420550 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 11 ways as a sum of consecutive naturals, for example, 327 + ... + 973.

It is an arithmetic number, because the mean of its divisors is an integer number (35154).

2⁴²⁰⁵⁵⁰ is an apocalyptic number.

420550 is an abundant number, since it is smaller than the sum of its proper divisors (423146).

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

420550 is a wasteful number, since it uses less digits than its factorization.

420550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 420550 is about 648.4982652251. The cubic root of 420550 is about 74.9213991356.

Adding to 420550 its reverse (55024), we get a palindrome (475574).

The spelling of 420550 in words is "four hundred twenty thousand, five hundred fifty".