684417 has 4 divisors (see below), whose sum is σ = 912560. Its totient is φ = 456276.

The previous prime is 684407. The next prime is 684419. The reversal of 684417 is 714486.

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 684417 - 2⁷ = 684289 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684419) 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, 114067 + ... + 114072.

It is an arithmetic number, because the mean of its divisors is an integer number (228140).

2⁶⁸⁴⁴¹⁷ is an apocalyptic number.

It is an amenable number.

684417 is a deficient number, since it is larger than the sum of its proper divisors (228143).

684417 is a wasteful number, since it uses less digits than its factorization.

684417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228142.

The product of its digits is 5376, while the sum is 30.

The square root of 684417 is about 827.2949897104. The cubic root of 684417 is about 88.1265826384.

The spelling of 684417 in words is "six hundred eighty-four thousand, four hundred seventeen".