647803 has 4 divisors (see below), whose sum is σ = 697648. Its totient is φ = 597960.

The previous prime is 647789. The next prime is 647809. The reversal of 647803 is 308746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308746 = 2 ⋅154373.

It is a cyclic number.

It is not a de Polignac number, because 647803 - 2⁵ = 647771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647809) 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, 24903 + ... + 24928.

It is an arithmetic number, because the mean of its divisors is an integer number (174412).

2⁶⁴⁷⁸⁰³ is an apocalyptic number.

647803 is a deficient number, since it is larger than the sum of its proper divisors (49845).

647803 is a wasteful number, since it uses less digits than its factorization.

647803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49844.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 647803 is about 804.8620999898. The cubic root of 647803 is about 86.5262040961.

The spelling of 647803 in words is "six hundred forty-seven thousand, eight hundred three".