646455 has 16 divisors (see below), whose sum is σ = 1050624. Its totient is φ = 339360.

The previous prime is 646453. The next prime is 646519. The reversal of 646455 is 554646.

It is not a de Polignac number, because 646455 - 2¹ = 646453 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646455.

It is not an unprimeable number, because it can be changed into a prime (646453) 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 in 15 ways as a sum of consecutive naturals, for example, 762 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (65664).

2⁶⁴⁶⁴⁵⁵ is an apocalyptic number.

646455 is a deficient number, since it is larger than the sum of its proper divisors (404169).

646455 is a wasteful number, since it uses less digits than its factorization.

646455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its digits is 14400, while the sum is 30.

The square root of 646455 is about 804.0242533655. The cubic root of 646455 is about 86.4661455498.

Subtracting from 646455 its reverse (554646), we obtain a square (91809 = 303²).

The spelling of 646455 in words is "six hundred forty-six thousand, four hundred fifty-five".