647973 has 16 divisors (see below), whose sum is σ = 973440. Its totient is φ = 425952.

The previous prime is 647963. The next prime is 647987. The reversal of 647973 is 379746.

647973 is a `hidden beast` number, since 647 + 9 + 7 + 3 = 666.

647973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647973 - 2⁶ = 647909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2665 + ... + 2897.

It is an arithmetic number, because the mean of its divisors is an integer number (60840).

2⁶⁴⁷⁹⁷³ is an apocalyptic number.

It is an amenable number.

647973 is a deficient number, since it is larger than the sum of its proper divisors (325467).

647973 is a wasteful number, since it uses less digits than its factorization.

647973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 339 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 647973 is about 804.9677012154. The cubic root of 647973 is about 86.5337723271.

The spelling of 647973 in words is "six hundred forty-seven thousand, nine hundred seventy-three".