647959423 has 4 divisors (see below), whose sum is σ = 648027280. Its totient is φ = 647891568.

The previous prime is 647959421. The next prime is 647959439. The reversal of 647959423 is 324959746.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 324959746 = 2 ⋅162479873.

It is a cyclic number.

It is not a de Polignac number, because 647959423 - 2¹ = 647959421 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 (647959421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16683 + ... + 39676.

It is an arithmetic number, because the mean of its divisors is an integer number (162006820).

Almost surely, 2^647959423 is an apocalyptic number.

647959423 is a deficient number, since it is larger than the sum of its proper divisors (67857).

647959423 is a wasteful number, since it uses less digits than its factorization.

647959423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67856.

The product of its digits is 1632960, while the sum is 49.

The square root of 647959423 is about 25455.0471026867. The cubic root of 647959423 is about 865.3316794121.

The spelling of 647959423 in words is "six hundred forty-seven million, nine hundred fifty-nine thousand, four hundred twenty-three".