421279 has 2 divisors, whose sum is σ = 421280. Its totient is φ = 421278.

The previous prime is 421273. The next prime is 421303. The reversal of 421279 is 972124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421279 - 2¹¹ = 419231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210639 + 210640.

It is an arithmetic number, because the mean of its divisors is an integer number (210640).

2⁴²¹²⁷⁹ is an apocalyptic number.

421279 is a deficient number, since it is larger than the sum of its proper divisors (1).

421279 is an equidigital number, since it uses as much as digits as its factorization.

421279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 421279 is about 649.0600896681. The cubic root of 421279 is about 74.9646648364.

The spelling of 421279 in words is "four hundred twenty-one thousand, two hundred seventy-nine".