647405 has 16 divisors (see below), whose sum is σ = 864000. Its totient is φ = 461760.

The previous prime is 647401. The next prime is 647417. The reversal of 647405 is 504746.

It is not a de Polignac number, because 647405 - 2² = 647401 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 647405.

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

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, 4271 + ... + 4419.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁶⁴⁷⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

647405 is a deficient number, since it is larger than the sum of its proper divisors (216595).

647405 is a wasteful number, since it uses less digits than its factorization.

647405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 647405 is about 804.6148146784. The cubic root of 647405 is about 86.5084803518.

The spelling of 647405 in words is "six hundred forty-seven thousand, four hundred five".