647959 has 4 divisors (see below), whose sum is σ = 697816. Its totient is φ = 598104.

The previous prime is 647953. The next prime is 647963. The reversal of 647959 is 959746.

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

It is not a de Polignac number, because 647959 - 2³ = 647951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647951) 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 3 ways as a sum of consecutive naturals, for example, 24909 + ... + 24934.

It is an arithmetic number, because the mean of its divisors is an integer number (174454).

2⁶⁴⁷⁹⁵⁹ is an apocalyptic number.

647959 is a deficient number, since it is larger than the sum of its proper divisors (49857).

647959 is a wasteful number, since it uses less digits than its factorization.

647959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49856.

The product of its digits is 68040, while the sum is 40.

The square root of 647959 is about 804.9590051673. The cubic root of 647959 is about 86.5331491111.

The spelling of 647959 in words is "six hundred forty-seven thousand, nine hundred fifty-nine".