647406 has 32 divisors (see below), whose sum is σ = 1516800. Its totient is φ = 204120.

The previous prime is 647401. The next prime is 647417. The reversal of 647406 is 604746.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 647406.

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 647406.

It is not an unprimeable number, because it can be changed into a prime (647401) by changing a digit.

647406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (47400).

2⁶⁴⁷⁴⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758400).

647406 is an abundant number, since it is smaller than the sum of its proper divisors (869394).

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

647406 is a wasteful number, since it uses less digits than its factorization.

647406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 647406 is about 804.6154360935. The cubic root of 647406 is about 86.5085248929.

It can be divided in two parts, 64740 and 6, that added together give a palindrome (64746).

The spelling of 647406 in words is "six hundred forty-seven thousand, four hundred six".