640846 has 8 divisors (see below), whose sum is σ = 975024. Its totient is φ = 315840.

The previous prime is 640837. The next prime is 640847. The reversal of 640846 is 648046.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640847) 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 in 3 ways as a sum of consecutive naturals, for example, 2115 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (121878).

2⁶⁴⁰⁸⁴⁶ is an apocalyptic number.

640846 is a deficient number, since it is larger than the sum of its proper divisors (334178).

640846 is a wasteful number, since it uses less digits than its factorization.

640846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 640846 is about 800.5285753800. The cubic root of 640846 is about 86.2153427936.

The spelling of 640846 in words is "six hundred forty thousand, eight hundred forty-six".