646245 has 16 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 344592.

The previous prime is 646237. The next prime is 646253. The reversal of 646245 is 542646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646237) and next prime (646253).

It is not a de Polignac number, because 646245 - 2³ = 646237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2259 + ... + 2528.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2⁶⁴⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

646245 is a deficient number, since it is larger than the sum of its proper divisors (502875).

646245 is a wasteful number, since it uses less digits than its factorization.

646245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4801 (or 4795 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 646245 is about 803.8936496826. The cubic root of 646245 is about 86.4567817337.

The spelling of 646245 in words is "six hundred forty-six thousand, two hundred forty-five".