647905389 has 8 divisors (see below), whose sum is σ = 872780160. Its totient is φ = 427483776.

The previous prime is 647905369. The next prime is 647905399. The reversal of 647905389 is 983509746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647905389 - 2¹¹ = 647903341 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647905369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112949 + ... + 1113530.

It is an arithmetic number, because the mean of its divisors is an integer number (109097520).

Almost surely, 2^647905389 is an apocalyptic number.

It is an amenable number.

647905389 is a deficient number, since it is larger than the sum of its proper divisors (224874771).

647905389 is a wasteful number, since it uses less digits than its factorization.

647905389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226579.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 647905389 is about 25453.9857193328. The cubic root of 647905389 is about 865.3076251117.

The spelling of 647905389 in words is "six hundred forty-seven million, nine hundred five thousand, three hundred eighty-nine".