647469 has 6 divisors (see below), whose sum is σ = 935246. Its totient is φ = 431640.

The previous prime is 647453. The next prime is 647477. The reversal of 647469 is 964746.

647469 is a `hidden beast` number, since 647 + 4 + 6 + 9 = 666.

647469 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., 455625 + 191844 = 675^2 + 438^2 .

It is not a de Polignac number, because 647469 - 2⁴ = 647453 is a prime.

It is a super-2 number, since 2×647469² = 838432211922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647429) 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, 35962 + ... + 35979.

2⁶⁴⁷⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

647469 is a deficient number, since it is larger than the sum of its proper divisors (287777).

647469 is a wasteful number, since it uses less digits than its factorization.

647469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71947 (or 71944 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 647469 is about 804.6545842782. The cubic root of 647469 is about 86.5113308912.

The spelling of 647469 in words is "six hundred forty-seven thousand, four hundred sixty-nine".