636469 has 2 divisors, whose sum is σ = 636470. Its totient is φ = 636468.

The previous prime is 636421. The next prime is 636473. The reversal of 636469 is 964636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348100 + 288369 = 590^2 + 537^2 .

It is a cyclic number.

It is not a de Polignac number, because 636469 - 2¹¹ = 634421 is a prime.

It is a super-2 number, since 2×636469² = 810185575922, which contains 22 as substring.

636469 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636409) 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 as a sum of consecutive naturals, namely, 318234 + 318235.

It is an arithmetic number, because the mean of its divisors is an integer number (318235).

2⁶³⁶⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

636469 is a deficient number, since it is larger than the sum of its proper divisors (1).

636469 is an equidigital number, since it uses as much as digits as its factorization.

636469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 636469 is about 797.7900726382. The cubic root of 636469 is about 86.0186096378.

The spelling of 636469 in words is "six hundred thirty-six thousand, four hundred sixty-nine".