636398465 has 8 divisors (see below), whose sum is σ = 763993728. Its totient is φ = 508908400.

The previous prime is 636398387. The next prime is 636398467. The reversal of 636398465 is 564893636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 636398465 - 2¹⁴ = 636382081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636398467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12311 + ... + 37740.

It is an arithmetic number, because the mean of its divisors is an integer number (95499216).

Almost surely, 2^636398465 is an apocalyptic number.

It is an amenable number.

636398465 is a deficient number, since it is larger than the sum of its proper divisors (127595263).

636398465 is a wasteful number, since it uses less digits than its factorization.

636398465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52599.

The product of its digits is 2799360, while the sum is 50.

The square root of 636398465 is about 25226.9392713425. The cubic root of 636398465 is about 860.1543192514.

The spelling of 636398465 in words is "six hundred thirty-six million, three hundred ninety-eight thousand, four hundred sixty-five".