404217 has 16 divisors (see below), whose sum is σ = 653760. Its totient is φ = 244800.

The previous prime is 404213. The next prime is 404221. The reversal of 404217 is 712404.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (404213) and next prime (404221).

It is not a de Polignac number, because 404217 - 2² = 404213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404217.

It is not an unprimeable number, because it can be changed into a prime (404213) 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 15 ways as a sum of consecutive naturals, for example, 384 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (40860).

2⁴⁰⁴²¹⁷ is an apocalyptic number.

It is an amenable number.

404217 is a deficient number, since it is larger than the sum of its proper divisors (249543).

404217 is a wasteful number, since it uses less digits than its factorization.

404217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 404217 is about 635.7806225421. The cubic root of 404217 is about 73.9386513696.

The spelling of 404217 in words is "four hundred four thousand, two hundred seventeen", and thus it is an iban number.