647834 has 12 divisors (see below), whose sum is σ = 1068522. Its totient is φ = 294360.

The previous prime is 647821. The next prime is 647837. The reversal of 647834 is 438746.

It is a happy number.

647834 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., 644809 + 3025 = 803^2 + 55^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647834.

It is not an unprimeable number, because it can be changed into a prime (647837) 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, 1097 + ... + 1580.

2⁶⁴⁷⁸³⁴ is an apocalyptic number.

647834 is a deficient number, since it is larger than the sum of its proper divisors (420688).

647834 is a wasteful number, since it uses less digits than its factorization.

647834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701 (or 2690 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 647834 is about 804.8813577168. The cubic root of 647834 is about 86.5275842840.

The spelling of 647834 in words is "six hundred forty-seven thousand, eight hundred thirty-four".