8638418 has 4 divisors (see below), whose sum is σ = 12957630. Its totient is φ = 4319208.

The previous prime is 8638411. The next prime is 8638447. The reversal of 8638418 is 8148368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5938969 + 2699449 = 2437^2 + 1643^2 .

It is not an unprimeable number, because it can be changed into a prime (8638411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2159603 + ... + 2159606.

Almost surely, 2^8638418 is an apocalyptic number.

8638418 is a deficient number, since it is larger than the sum of its proper divisors (4319212).

8638418 is a wasteful number, since it uses less digits than its factorization.

8638418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319211.

The product of its digits is 36864, while the sum is 38.

The square root of 8638418 is about 2939.1185753555. The cubic root of 8638418 is about 205.1845888462.

The spelling of 8638418 in words is "eight million, six hundred thirty-eight thousand, four hundred eighteen".