100005855 has 16 divisors (see below), whose sum is σ = 160139904. Its totient is φ = 53292960.

The previous prime is 100005853. The next prime is 100005877. The reversal of 100005855 is 558500001.

It is not a de Polignac number, because 100005855 - 2¹ = 100005853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100005853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26220 + ... + 29790.

It is an arithmetic number, because the mean of its divisors is an integer number (10008744).

Almost surely, 2^100005855 is an apocalyptic number.

100005855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100005855 is a deficient number, since it is larger than the sum of its proper divisors (60134049).

100005855 is a wasteful number, since it uses less digits than its factorization.

100005855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5446.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 100005855 is about 10000.2927457150. The cubic root of 100005855 is about 464.1679420187.

Adding to 100005855 its reverse (558500001), we get a palindrome (658505856).

The spelling of 100005855 in words is "one hundred million, five thousand, eight hundred fifty-five".