647982 has 12 divisors (see below), whose sum is σ = 1404000. Its totient is φ = 215988.

The previous prime is 647963. The next prime is 647987. The reversal of 647982 is 289746.

647982 is a `hidden beast` number, since 647 + 9 + 8 + 2 = 666.

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 647982.

It is not an unprimeable number, because it can be changed into a prime (647987) by changing a digit.

647982 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 17982 + ... + 18017.

It is an arithmetic number, because the mean of its divisors is an integer number (117000).

2⁶⁴⁷⁹⁸² is an apocalyptic number.

647982 is an abundant number, since it is smaller than the sum of its proper divisors (756018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647982 is a wasteful number, since it uses less digits than its factorization.

647982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36007 (or 36004 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 647982 is about 804.9732914824. The cubic root of 647982 is about 86.5341729613.

It can be divided in two parts, 6479 and 82, that added together give a 8-th power (6561 = 3⁸).

The spelling of 647982 in words is "six hundred forty-seven thousand, nine hundred eighty-two".