421775 has 6 divisors (see below), whose sum is σ = 523032. Its totient is φ = 337400.

The previous prime is 421741. The next prime is 421783. The reversal of 421775 is 577124.

It is not a de Polignac number, because 421775 - 2⁶ = 421711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421775.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 8411 + ... + 8460.

It is an arithmetic number, because the mean of its divisors is an integer number (87172).

2⁴²¹⁷⁷⁵ is an apocalyptic number.

421775 is a deficient number, since it is larger than the sum of its proper divisors (101257).

421775 is a wasteful number, since it uses less digits than its factorization.

421775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16881 (or 16876 counting only the distinct ones).

The product of its digits is 1960, while the sum is 26.

The square root of 421775 is about 649.4420682401. The cubic root of 421775 is about 74.9940736058.

Adding to 421775 its reverse (577124), we get a palindrome (998899).

The spelling of 421775 in words is "four hundred twenty-one thousand, seven hundred seventy-five".