636245 has 4 divisors (see below), whose sum is σ = 763500. Its totient is φ = 508992.

The previous prime is 636241. The next prime is 636247. The reversal of 636245 is 542636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 470596 = 407^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 636245 - 2² = 636241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636241) 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 3 ways as a sum of consecutive naturals, for example, 63620 + ... + 63629.

It is an arithmetic number, because the mean of its divisors is an integer number (190875).

2⁶³⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

636245 is a deficient number, since it is larger than the sum of its proper divisors (127255).

636245 is a wasteful number, since it uses less digits than its factorization.

636245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127254.

The product of its digits is 4320, while the sum is 26.

The square root of 636245 is about 797.6496724753. The cubic root of 636245 is about 86.0085172743.

It can be divided in two parts, 6 and 36245, that multiplied together give a triangular number (217470 = T₆₅₉).

The spelling of 636245 in words is "six hundred thirty-six thousand, two hundred forty-five".