420489 has 12 divisors (see below), whose sum is σ = 639600. Its totient is φ = 265464.

The previous prime is 420481. The next prime is 420499. The reversal of 420489 is 984024.

It is not a de Polignac number, because 420489 - 2³ = 420481 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420489.

It is not an unprimeable number, because it can be changed into a prime (420481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1059 + ... + 1400.

It is an arithmetic number, because the mean of its divisors is an integer number (53300).

2⁴²⁰⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

420489 is a deficient number, since it is larger than the sum of its proper divisors (219111).

420489 is a wasteful number, since it uses less digits than its factorization.

420489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 420489 is about 648.4512317823. The cubic root of 420489 is about 74.9177765570.

It can be divided in two parts, 420 and 489, that added together give a palindrome (909).

The spelling of 420489 in words is "four hundred twenty thousand, four hundred eighty-nine".