647915 has 8 divisors (see below), whose sum is σ = 785808. Its totient is φ = 512800.

The previous prime is 647909. The next prime is 647917. The reversal of 647915 is 519746.

It is a happy number.

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

It is not a de Polignac number, because 647915 - 2⁶ = 647851 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647915.

It is not an unprimeable number, because it can be changed into a prime (647917) 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, 137 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (98226).

2⁶⁴⁷⁹¹⁵ is an apocalyptic number.

647915 is a deficient number, since it is larger than the sum of its proper divisors (137893).

647915 is a wasteful number, since it uses less digits than its factorization.

647915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389.

The product of its digits is 7560, while the sum is 32.

The square root of 647915 is about 804.9316741190. The cubic root of 647915 is about 86.5311903736.

The spelling of 647915 in words is "six hundred forty-seven thousand, nine hundred fifteen".