421289 has 4 divisors (see below), whose sum is σ = 459600. Its totient is φ = 382980.

The previous prime is 421279. The next prime is 421303. The reversal of 421289 is 982124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421289 - 2⁴ = 421273 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (421279) 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, 19139 + ... + 19160.

It is an arithmetic number, because the mean of its divisors is an integer number (114900).

2⁴²¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

421289 is a deficient number, since it is larger than the sum of its proper divisors (38311).

421289 is a wasteful number, since it uses less digits than its factorization.

421289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38310.

The product of its digits is 1152, while the sum is 26.

The square root of 421289 is about 649.0677930694. The cubic root of 421289 is about 74.9652579831.

It can be divided in two parts, 42 and 1289, that added together give a palindrome (1331).

The spelling of 421289 in words is "four hundred twenty-one thousand, two hundred eighty-nine".