647243 has 8 divisors (see below), whose sum is σ = 684288. Its totient is φ = 610984.

The previous prime is 647219. The next prime is 647261. The reversal of 647243 is 342746.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647243 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647243.

It is not an unprimeable number, because it can be changed into a prime (647263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330 + ... + 2592.

It is an arithmetic number, because the mean of its divisors is an integer number (85536).

2⁶⁴⁷²⁴³ is an apocalyptic number.

647243 is a deficient number, since it is larger than the sum of its proper divisors (37045).

647243 is a wasteful number, since it uses less digits than its factorization.

647243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its digits is 4032, while the sum is 26.

The square root of 647243 is about 804.5141390927. The cubic root of 647243 is about 86.5012640843.

Adding to 647243 its reverse (342746), we get a palindrome (989989).

The spelling of 647243 in words is "six hundred forty-seven thousand, two hundred forty-three".