8638369 has 6 divisors (see below), whose sum is σ = 9117330. Its totient is φ = 8183376.

The previous prime is 8638349. The next prime is 8638373. The reversal of 8638369 is 9638368.

8638369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7907344 + 731025 = 2812^2 + 855^2 .

It is not a de Polignac number, because 8638369 - 2⁵ = 8638337 is a prime.

It is a super-2 number, since 2×8638369² = 149242837960322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8638319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11604 + ... + 12325.

It is an arithmetic number, because the mean of its divisors is an integer number (1519555).

Almost surely, 2^8638369 is an apocalyptic number.

It is an amenable number.

8638369 is a deficient number, since it is larger than the sum of its proper divisors (478961).

8638369 is a wasteful number, since it uses less digits than its factorization.

8638369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23967 (or 23948 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 8638369 is about 2939.1102395113. The cubic root of 8638369 is about 205.1842008869.

Subtracting 8638369 from its reverse (9638368), we obtain a palindrome (999999).

The spelling of 8638369 in words is "eight million, six hundred thirty-eight thousand, three hundred sixty-nine".