647841 has 16 divisors (see below), whose sum is σ = 927360. Its totient is φ = 401280.

The previous prime is 647839. The next prime is 647851. The reversal of 647841 is 148746.

It is not a de Polignac number, because 647841 - 2¹ = 647839 is a prime.

It is a super-2 number, since 2×647841² = 839395922562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647799 and 647808.

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 647841.

It is not an unprimeable number, because it can be changed into a prime (647821) 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, 2715 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (57960).

2⁶⁴⁷⁸⁴¹ is an apocalyptic number.

It is an amenable number.

647841 is a deficient number, since it is larger than the sum of its proper divisors (279519).

647841 is a wasteful number, since it uses less digits than its factorization.

647841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296.

The product of its digits is 5376, while the sum is 30.

The square root of 647841 is about 804.8857061720. The cubic root of 647841 is about 86.5278959333.

The spelling of 647841 in words is "six hundred forty-seven thousand, eight hundred forty-one".