646247 has 16 divisors (see below), whose sum is σ = 802560. Its totient is φ = 508032.

The previous prime is 646237. The next prime is 646253. The reversal of 646247 is 742646.

It is not a de Polignac number, because 646247 - 2⁶ = 646183 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5663 + ... + 5775.

It is an arithmetic number, because the mean of its divisors is an integer number (50160).

2⁶⁴⁶²⁴⁷ is an apocalyptic number.

646247 is a deficient number, since it is larger than the sum of its proper divisors (156313).

646247 is a wasteful number, since it uses less digits than its factorization.

646247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182.

The product of its digits is 8064, while the sum is 29.

The square root of 646247 is about 803.8948936273. The cubic root of 646247 is about 86.4568709225.

The spelling of 646247 in words is "six hundred forty-six thousand, two hundred forty-seven".