636449 has 4 divisors (see below), whose sum is σ = 694320. Its totient is φ = 578580.

The previous prime is 636421. The next prime is 636469. The reversal of 636449 is 944636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 636449 - 2⁸ = 636193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (636409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28919 + ... + 28940.

It is an arithmetic number, because the mean of its divisors is an integer number (173580).

2⁶³⁶⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

636449 is a deficient number, since it is larger than the sum of its proper divisors (57871).

636449 is a wasteful number, since it uses less digits than its factorization.

636449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57870.

The product of its digits is 15552, while the sum is 32.

The square root of 636449 is about 797.7775379139. Note that the first 3 decimals coincide. The cubic root of 636449 is about 86.0177086302.

The spelling of 636449 in words is "six hundred thirty-six thousand, four hundred forty-nine".