647393 has 4 divisors (see below), whose sum is σ = 658068. Its totient is φ = 636720.

The previous prime is 647371. The next prime is 647399. The reversal of 647393 is 393746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393746 = 2 ⋅196873.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 277729 = 608^2 + 527^2 .

It is a cyclic number.

It is not a de Polignac number, because 647393 - 2¹⁶ = 581857 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647393.

It is not an unprimeable number, because it can be changed into a prime (647399) 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, 5246 + ... + 5367.

It is an arithmetic number, because the mean of its divisors is an integer number (164517).

2⁶⁴⁷³⁹³ is an apocalyptic number.

It is an amenable number.

647393 is a deficient number, since it is larger than the sum of its proper divisors (10675).

647393 is a wasteful number, since it uses less digits than its factorization.

647393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10674.

The product of its digits is 13608, while the sum is 32.

The square root of 647393 is about 804.6073576596. The cubic root of 647393 is about 86.5079458548.

The spelling of 647393 in words is "six hundred forty-seven thousand, three hundred ninety-three".