647407 has 4 divisors (see below), whose sum is σ = 658440. Its totient is φ = 636376.

The previous prime is 647401. The next prime is 647417. The reversal of 647407 is 704746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647407 - 2³ = 647399 is a prime.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5428 + ... + 5545.

It is an arithmetic number, because the mean of its divisors is an integer number (164610).

2⁶⁴⁷⁴⁰⁷ is an apocalyptic number.

647407 is a deficient number, since it is larger than the sum of its proper divisors (11033).

647407 is a wasteful number, since it uses less digits than its factorization.

647407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 647407 is about 804.6160575082. The cubic root of 647407 is about 86.5085694340.

The spelling of 647407 in words is "six hundred forty-seven thousand, four hundred seven".