643417 has 4 divisors (see below), whose sum is σ = 645300. Its totient is φ = 641536.

The previous prime is 643403. The next prime is 643421. The reversal of 643417 is 714346.

643417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 175561 = 684^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 643417 - 2¹⁹ = 119129 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 643391 and 643400.

It is not an unprimeable number, because it can be changed into a prime (643457) 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, 268 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (161325).

2⁶⁴³⁴¹⁷ is an apocalyptic number.

It is an amenable number.

643417 is a deficient number, since it is larger than the sum of its proper divisors (1883).

643417 is a wasteful number, since it uses less digits than its factorization.

643417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882.

The product of its digits is 2016, while the sum is 25.

The square root of 643417 is about 802.1327820255. The cubic root of 643417 is about 86.3304842789.

It can be divided in two parts, 64 and 3417, that added together give a square (3481 = 59²).

The spelling of 643417 in words is "six hundred forty-three thousand, four hundred seventeen".