646937 has 2 divisors, whose sum is σ = 646938. Its totient is φ = 646936.

The previous prime is 646927. The next prime is 646957. The reversal of 646937 is 739646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 495616 + 151321 = 704^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 646937 - 2⁶ = 646873 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 646897 and 646906.

It is not a weakly prime, because it can be changed into another prime (646927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323468 + 323469.

It is an arithmetic number, because the mean of its divisors is an integer number (323469).

2⁶⁴⁶⁹³⁷ is an apocalyptic number.

It is an amenable number.

646937 is a deficient number, since it is larger than the sum of its proper divisors (1).

646937 is an equidigital number, since it uses as much as digits as its factorization.

646937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 646937 is about 804.3239397158. The cubic root of 646937 is about 86.4876300709.

The spelling of 646937 in words is "six hundred forty-six thousand, nine hundred thirty-seven".