420445 has 4 divisors (see below), whose sum is σ = 504540.
Its totient is φ = 336352.
The previous prime is 420439. The next prime is 420457. The reversal of 420445 is 544024.
Adding to 420445 its reverse (544024), we get a palindrome (964469).
It can be divided in two parts, 4 and 20445, that added together give a square (20449 = 1432).
420445 = 4582 + 4592.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 210681 = 458^2 + 459^2
It is a cyclic number.
It is not a de Polignac number, because 420445 - 27 = 420317 is a prime.
420445 is a lucky number.
It is a congruent number.
It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 42040 + ... + 42049.
It is an arithmetic number, because the mean of its divisors is an integer number (126135).
2420445 is an apocalyptic number.
420445 is the 459-th centered square number.
It is an amenable number.
420445 is a deficient number, since it is larger than the sum of its proper divisors (84095).
420445 is an equidigital number, since it uses as much as digits as its factorization.
420445 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 84094.
The product of its (nonzero) digits is 640, while the sum is 19.
The square root of 420445 is about 648.4173039024.
The cubic root of 420445 is about 74.9151633320.
The spelling of 420445 in words is "four hundred twenty thousand, four hundred forty-five".