636393 has 4 divisors (see below), whose sum is σ = 848528. Its totient is φ = 424260.

The previous prime is 636359. The next prime is 636403. The reversal of 636393 is 393636.

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 not a de Polignac number, because 636393 - 2⁸ = 636137 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 636393.

It is not an unprimeable number, because it can be changed into a prime (636313) 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, 106063 + ... + 106068.

It is an arithmetic number, because the mean of its divisors is an integer number (212132).

2⁶³⁶³⁹³ is an apocalyptic number.

It is an amenable number.

636393 is a deficient number, since it is larger than the sum of its proper divisors (212135).

636393 is a wasteful number, since it uses less digits than its factorization.

636393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212134.

The product of its digits is 8748, while the sum is 30.

The square root of 636393 is about 797.7424396383. The cubic root of 636393 is about 86.0151857085.

The spelling of 636393 in words is "six hundred thirty-six thousand, three hundred ninety-three".