6436 has 6 divisors (see below), whose sum is σ = 11270. Its totient is φ = 3216.

The previous prime is 6427. The next prime is 6449. The reversal of 6436 is 6346.

6436 = T₆₄ + T₆₅ + T₆₆.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6400 + 36 = 80^2 + 6^2 .

It is a plaindrome in base 8.

It is a nialpdrome in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801 + ... + 808.

2⁶⁴³⁶ is an apocalyptic number.

6436 is the 66-th centered triangular number.

It is an amenable number.

6436 is a deficient number, since it is larger than the sum of its proper divisors (4834).

6436 is a wasteful number, since it uses less digits than its factorization.

6436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613 (or 1611 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 6436 is about 80.2246844805. The cubic root of 6436 is about 18.6011021816.

It can be divided in two parts, 64 and 36, that multiplied together give a square (2304 = 48²).

The spelling of 6436 in words is "six thousand, four hundred thirty-six".