647539 has 8 divisors (see below), whose sum is σ = 689040. Its totient is φ = 606816.

The previous prime is 647531. The next prime is 647551. The reversal of 647539 is 935746.

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

It is a cyclic number.

It is not a de Polignac number, because 647539 - 2³ = 647531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647531) 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 7 ways as a sum of consecutive naturals, for example, 3189 + ... + 3385.

It is an arithmetic number, because the mean of its divisors is an integer number (86130).

2⁶⁴⁷⁵³⁹ is an apocalyptic number.

647539 is a deficient number, since it is larger than the sum of its proper divisors (41501).

647539 is a wasteful number, since it uses less digits than its factorization.

647539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389.

The product of its digits is 22680, while the sum is 34.

The square root of 647539 is about 804.6980800275. The cubic root of 647539 is about 86.5144484535.

The spelling of 647539 in words is "six hundred forty-seven thousand, five hundred thirty-nine".