1812100 has 18 divisors (see below), whose sum is σ = 3932474. Its totient is φ = 724800.

The previous prime is 1812091. The next prime is 1812103. The reversal of 1812100 is 12181.

It can be written as a sum of positive squares in 3 ways, for example, as 53824 + 1758276 = 232^2 + 1326^2 .

It is not an unprimeable number, because it can be changed into a prime (1812103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8961 + ... + 9160.

2^1812100 is an apocalyptic number.

1812100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812100 is an abundant number, since it is smaller than the sum of its proper divisors (2120374).

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

1812100 is a wasteful number, since it uses less digits than its factorization.

1812100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18135 (or 18128 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1812100 is about 1346.1426373160. The cubic root of 1812100 is about 121.9160041735.

Adding to 1812100 its reverse (12181), we get a palindrome (1824281).

The spelling of 1812100 in words is "one million, eight hundred twelve thousand, one hundred".