100812 has 24 divisors (see below), whose sum is σ = 243712. Its totient is φ = 32400.

The previous prime is 100811. The next prime is 100823. The reversal of 100812 is 218001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100811) 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, 237 + ... + 507.

2¹⁰⁰⁸¹² is an apocalyptic number.

100812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

100812 is an abundant number, since it is smaller than the sum of its proper divisors (142900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100812 is a wasteful number, since it uses less digits than its factorization.

100812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 100812 is about 317.5090549890. The cubic root of 100812 is about 46.5411821548.

Adding to 100812 its reverse (218001), we get a palindrome (318813).

The spelling of 100812 in words is "one hundred thousand, eight hundred twelve".