100005638 has 4 divisors (see below), whose sum is σ = 150008460. Its totient is φ = 50002818.

The previous prime is 100005637. The next prime is 100005641. The reversal of 100005638 is 836500001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836500001 = 31 ⋅26983871.

It is a super-2 number, since 2×100005638² = 20002255263574088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100005637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25001408 + ... + 25001411.

It is an arithmetic number, because the mean of its divisors is an integer number (37502115).

Almost surely, 2^100005638 is an apocalyptic number.

100005638 is a deficient number, since it is larger than the sum of its proper divisors (50002822).

100005638 is an equidigital number, since it uses as much as digits as its factorization.

100005638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50002821.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 100005638 is about 10000.2818960267. The cubic root of 100005638 is about 464.1676062900.

Adding to 100005638 its reverse (836500001), we get a palindrome (936505639).

The spelling of 100005638 in words is "one hundred million, five thousand, six hundred thirty-eight".