647499 has 4 divisors (see below), whose sum is σ = 863336. Its totient is φ = 431664.

The previous prime is 647489. The next prime is 647503. The reversal of 647499 is 994746.

647499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 647499 - 2⁷ = 647371 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647429) 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, 107914 + ... + 107919.

It is an arithmetic number, because the mean of its divisors is an integer number (215834).

2⁶⁴⁷⁴⁹⁹ is an apocalyptic number.

647499 is a deficient number, since it is larger than the sum of its proper divisors (215837).

647499 is a wasteful number, since it uses less digits than its factorization.

647499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215836.

The product of its digits is 54432, while the sum is 39.

The square root of 647499 is about 804.6732256015. The cubic root of 647499 is about 86.5126670168.

The spelling of 647499 in words is "six hundred forty-seven thousand, four hundred ninety-nine".