636393489 has 16 divisors (see below), whose sum is σ = 869142528. Its totient is φ = 414006992.

The previous prime is 636393449. The next prime is 636393493. The reversal of 636393489 is 984393636.

It is a cyclic number.

It is not a de Polignac number, because 636393489 - 2¹⁶ = 636327953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636393409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42424 + ... + 55430.

It is an arithmetic number, because the mean of its divisors is an integer number (54321408).

Almost surely, 2^636393489 is an apocalyptic number.

It is an amenable number.

636393489 is a deficient number, since it is larger than the sum of its proper divisors (232749039).

636393489 is a wasteful number, since it uses less digits than its factorization.

636393489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13404.

The product of its digits is 2519424, while the sum is 51.

The square root of 636393489 is about 25226.8406464226. The cubic root of 636393489 is about 860.1520773965.

The spelling of 636393489 in words is "six hundred thirty-six million, three hundred ninety-three thousand, four hundred eighty-nine".