636443 has 12 divisors (see below), whose sum is σ = 704088. Its totient is φ = 574560.

The previous prime is 636421. The next prime is 636469. The reversal of 636443 is 344636.

It is not a de Polignac number, because 636443 - 2¹² = 632347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636403) 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 11 ways as a sum of consecutive naturals, for example, 14780 + ... + 14822.

It is an arithmetic number, because the mean of its divisors is an integer number (58674).

2⁶³⁶⁴⁴³ is an apocalyptic number.

636443 is a deficient number, since it is larger than the sum of its proper divisors (67645).

636443 is a wasteful number, since it uses less digits than its factorization.

636443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 103 counting only the distinct ones).

The product of its digits is 5184, while the sum is 26.

The square root of 636443 is about 797.7737774582. The cubic root of 636443 is about 86.0174383242.

The spelling of 636443 in words is "six hundred thirty-six thousand, four hundred forty-three".