647447 has 4 divisors (see below), whose sum is σ = 649440. Its totient is φ = 645456.

The previous prime is 647441. The next prime is 647453. The reversal of 647447 is 744746.

647447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (647441) and next prime (647453).

It is a cyclic number.

It is not a de Polignac number, because 647447 - 2¹⁰ = 646423 is a prime.

It is a Duffinian number.

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 647447.

It is not an unprimeable number, because it can be changed into a prime (647441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (162360).

2⁶⁴⁷⁴⁴⁷ is an apocalyptic number.

647447 is a deficient number, since it is larger than the sum of its proper divisors (1993).

647447 is a wasteful number, since it uses less digits than its factorization.

647447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 18816, while the sum is 32.

The square root of 647447 is about 804.6409137000. The cubic root of 647447 is about 86.5103510395.

The spelling of 647447 in words is "six hundred forty-seven thousand, four hundred forty-seven".