646237 has 2 divisors, whose sum is σ = 646238. Its totient is φ = 646236.

The previous prime is 646199. The next prime is 646253. The reversal of 646237 is 732646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622521 + 23716 = 789^2 + 154^2 .

It is a cyclic number.

It is not a de Polignac number, because 646237 - 2¹⁵ = 613469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323118 + 323119.

It is an arithmetic number, because the mean of its divisors is an integer number (323119).

2⁶⁴⁶²³⁷ is an apocalyptic number.

It is an amenable number.

646237 is a deficient number, since it is larger than the sum of its proper divisors (1).

646237 is an equidigital number, since it uses as much as digits as its factorization.

646237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 646237 is about 803.8886738846. Note that the first 3 decimals coincide. The cubic root of 646237 is about 86.4564249768.

The spelling of 646237 in words is "six hundred forty-six thousand, two hundred thirty-seven".