647394 has 32 divisors (see below), whose sum is σ = 1498176. Its totient is φ = 184320.

The previous prime is 647371. The next prime is 647399. The reversal of 647394 is 493746.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 647394.

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 15 ways as a sum of consecutive naturals, for example, 834 + ... + 1410.

It is an arithmetic number, because the mean of its divisors is an integer number (46818).

2⁶⁴⁷³⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749088).

647394 is an abundant number, since it is smaller than the sum of its proper divisors (850782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647394 is a wasteful number, since it uses less digits than its factorization.

647394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610.

The product of its digits is 18144, while the sum is 33.

The square root of 647394 is about 804.6079790805. The cubic root of 647394 is about 86.5079903964.

The spelling of 647394 in words is "six hundred forty-seven thousand, three hundred ninety-four".