646927 has 2 divisors, whose sum is σ = 646928. Its totient is φ = 646926.

The previous prime is 646913. The next prime is 646937. The reversal of 646927 is 729646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646892 and 646901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323463 + 323464.

It is an arithmetic number, because the mean of its divisors is an integer number (323464).

2⁶⁴⁶⁹²⁷ is an apocalyptic number.

646927 is a deficient number, since it is larger than the sum of its proper divisors (1).

646927 is an equidigital number, since it uses as much as digits as its factorization.

646927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 646927 is about 804.3177232910. The cubic root of 646927 is about 86.4871844424.

The spelling of 646927 in words is "six hundred forty-six thousand, nine hundred twenty-seven".