647397 has 6 divisors (see below), whose sum is σ = 935142. Its totient is φ = 431592.

The previous prime is 647371. The next prime is 647399. The reversal of 647397 is 793746.

647397 is a `hidden beast` number, since 647 + 3 + 9 + 7 = 666.

647397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 349281 + 298116 = 591^2 + 546^2 .

It is not a de Polignac number, because 647397 - 2⁶ = 647333 is a prime.

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 647397.

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 5 ways as a sum of consecutive naturals, for example, 35958 + ... + 35975.

It is an arithmetic number, because the mean of its divisors is an integer number (155857).

2⁶⁴⁷³⁹⁷ is an apocalyptic number.

It is an amenable number.

647397 is a deficient number, since it is larger than the sum of its proper divisors (287745).

647397 is a wasteful number, since it uses less digits than its factorization.

647397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71939 (or 71936 counting only the distinct ones).

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

The square root of 647397 is about 804.6098433402. The cubic root of 647397 is about 86.5081240212.

It can be divided in two parts, 64739 and 7, that added together give a palindrome (64746).

The spelling of 647397 in words is "six hundred forty-seven thousand, three hundred ninety-seven".