647854 has 4 divisors (see below), whose sum is σ = 971784. Its totient is φ = 323926.

The previous prime is 647851. The next prime is 647861. The reversal of 647854 is 458746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458746 = 2 ⋅229373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647851) 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 as a sum of consecutive naturals, namely, 161962 + ... + 161965.

It is an arithmetic number, because the mean of its divisors is an integer number (242946).

2⁶⁴⁷⁸⁵⁴ is an apocalyptic number.

647854 is a deficient number, since it is larger than the sum of its proper divisors (323930).

647854 is a wasteful number, since it uses less digits than its factorization.

647854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323929.

The product of its digits is 26880, while the sum is 34.

The square root of 647854 is about 804.8937818122. The cubic root of 647854 is about 86.5284747044.

The spelling of 647854 in words is "six hundred forty-seven thousand, eight hundred fifty-four".