646459 has 8 divisors (see below), whose sum is σ = 746928. Its totient is φ = 552960.

The previous prime is 646453. The next prime is 646519. The reversal of 646459 is 954646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646459 - 2¹¹ = 644411 is a prime.

It is a Duffinian number.

646459 is a lucky number.

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 7 ways as a sum of consecutive naturals, for example, 1542 + ... + 1915.

It is an arithmetic number, because the mean of its divisors is an integer number (93366).

2⁶⁴⁶⁴⁵⁹ is an apocalyptic number.

646459 is a deficient number, since it is larger than the sum of its proper divisors (100469).

646459 is a wasteful number, since it uses less digits than its factorization.

646459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485.

The product of its digits is 25920, while the sum is 34.

The square root of 646459 is about 804.0267408488. The cubic root of 646459 is about 86.4663238885.

The spelling of 646459 in words is "six hundred forty-six thousand, four hundred fifty-nine".