406217 has 4 divisors (see below), whose sum is σ = 464256. Its totient is φ = 348180.

The previous prime is 406207. The next prime is 406247. The reversal of 406217 is 712604.

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 not a de Polignac number, because 406217 - 2¹⁸ = 144073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29009 + ... + 29022.

It is an arithmetic number, because the mean of its divisors is an integer number (116064).

2⁴⁰⁶²¹⁷ is an apocalyptic number.

It is an amenable number.

406217 is a deficient number, since it is larger than the sum of its proper divisors (58039).

406217 is an equidigital number, since it uses as much as digits as its factorization.

406217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58038.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 406217 is about 637.3515513435. The cubic root of 406217 is about 74.0603962739.

The spelling of 406217 in words is "four hundred six thousand, two hundred seventeen".