865638106 has 16 divisors (see below), whose sum is σ = 1328849280. Its totient is φ = 422800560.

The previous prime is 865638101. The next prime is 865638127. The reversal of 865638106 is 601836568.

It is not an unprimeable number, because it can be changed into a prime (865638101) 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, 12486 + ... + 43441.

It is an arithmetic number, because the mean of its divisors is an integer number (83053080).

Almost surely, 2^865638106 is an apocalyptic number.

865638106 is a deficient number, since it is larger than the sum of its proper divisors (463211174).

865638106 is a wasteful number, since it uses less digits than its factorization.

865638106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56109.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 865638106 is about 29421.7284672400. The cubic root of 865638106 is about 953.0421796868.

The spelling of 865638106 in words is "eight hundred sixty-five million, six hundred thirty-eight thousand, one hundred six".