647543 has 4 divisors (see below), whose sum is σ = 697368. Its totient is φ = 597720.

The previous prime is 647531. The next prime is 647551. The reversal of 647543 is 345746.

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

It is a cyclic number.

It is not a de Polignac number, because 647543 - 2⁴ = 647527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647543.

It is not an unprimeable number, because it can be changed into a prime (647503) 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, 24893 + ... + 24918.

It is an arithmetic number, because the mean of its divisors is an integer number (174342).

2⁶⁴⁷⁵⁴³ is an apocalyptic number.

647543 is a deficient number, since it is larger than the sum of its proper divisors (49825).

647543 is a wasteful number, since it uses less digits than its factorization.

647543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49824.

The product of its digits is 10080, while the sum is 29.

The square root of 647543 is about 804.7005654279. The cubic root of 647543 is about 86.5146265932.

The spelling of 647543 in words is "six hundred forty-seven thousand, five hundred forty-three".