646437 has 16 divisors (see below), whose sum is σ = 990720. Its totient is φ = 370800.

The previous prime is 646433. The next prime is 646453. The reversal of 646437 is 734646.

It is not a de Polignac number, because 646437 - 2² = 646433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646433) by changing a digit.

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, 112 + ... + 1142.

It is an arithmetic number, because the mean of its divisors is an integer number (61920).

2⁶⁴⁶⁴³⁷ is an apocalyptic number.

It is an amenable number.

646437 is a deficient number, since it is larger than the sum of its proper divisors (344283).

646437 is a wasteful number, since it uses less digits than its factorization.

646437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064.

The product of its digits is 12096, while the sum is 30.

The square root of 646437 is about 804.0130595954. The cubic root of 646437 is about 86.4653430164.

Subtracting 646437 from its reverse (734646), we obtain a square (88209 = 297²).

The spelling of 646437 in words is "six hundred forty-six thousand, four hundred thirty-seven".