421489 has 4 divisors (see below), whose sum is σ = 422820. Its totient is φ = 420160.

The previous prime is 421483. The next prime is 421493. The reversal of 421489 is 984124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 166464 = 505^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 421489 - 2⁷ = 421361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421483) by changing a digit.

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, 117 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (105705).

2⁴²¹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

421489 is a deficient number, since it is larger than the sum of its proper divisors (1331).

421489 is an equidigital number, since it uses as much as digits as its factorization.

421489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its digits is 2304, while the sum is 28.

The square root of 421489 is about 649.2218419000. The cubic root of 421489 is about 74.9771189461.

The spelling of 421489 in words is "four hundred twenty-one thousand, four hundred eighty-nine".