421817 has 8 divisors (see below), whose sum is σ = 475392. Its totient is φ = 370800.

The previous prime is 421807. The next prime is 421831. The reversal of 421817 is 718124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421817 - 2⁴ = 421801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421792 and 421801.

It is not an unprimeable number, because it can be changed into a prime (421807) 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 in 7 ways as a sum of consecutive naturals, for example, 278 + ... + 959.

It is an arithmetic number, because the mean of its divisors is an integer number (59424).

2⁴²¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

421817 is a deficient number, since it is larger than the sum of its proper divisors (53575).

421817 is a wasteful number, since it uses less digits than its factorization.

421817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its digits is 448, while the sum is 23.

The square root of 421817 is about 649.4744028828. The cubic root of 421817 is about 74.9965628054.

The spelling of 421817 in words is "four hundred twenty-one thousand, eight hundred seventeen".