646922 has 8 divisors (see below), whose sum is σ = 979776. Its totient is φ = 320332.

The previous prime is 646913. The next prime is 646927. The reversal of 646922 is 229646.

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

It is an Ulam number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (646927) 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, 1298 + ... + 1725.

It is an arithmetic number, because the mean of its divisors is an integer number (122472).

2⁶⁴⁶⁹²² is an apocalyptic number.

646922 is a deficient number, since it is larger than the sum of its proper divisors (332854).

646922 is a wasteful number, since it uses less digits than its factorization.

646922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132.

The product of its digits is 5184, while the sum is 29.

The square root of 646922 is about 804.3146150605. The cubic root of 646922 is about 86.4869616264.

The spelling of 646922 in words is "six hundred forty-six thousand, nine hundred twenty-two".