8638906 has 4 divisors (see below), whose sum is σ = 12958362. Its totient is φ = 4319452.

The previous prime is 8638891. The next prime is 8638909. The reversal of 8638906 is 6098368.

8638906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 4473225 + 4165681 = 2115^2 + 2041^2 .

It is not an unprimeable number, because it can be changed into a prime (8638909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2159725 + ... + 2159728.

Almost surely, 2^8638906 is an apocalyptic number.

8638906 is a deficient number, since it is larger than the sum of its proper divisors (4319456).

8638906 is a wasteful number, since it uses less digits than its factorization.

8638906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319455.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 8638906 is about 2939.2015922696. The cubic root of 8638906 is about 205.1884525241.

The spelling of 8638906 in words is "eight million, six hundred thirty-eight thousand, nine hundred six".