1818100 has 18 divisors (see below), whose sum is σ = 3945494. Its totient is φ = 727200.

The previous prime is 1818079. The next prime is 1818107. The reversal of 1818100 is 18181.

It can be written as a sum of positive squares in 3 ways, for example, as 467856 + 1350244 = 684^2 + 1162^2 .

It is a super-2 number, since 2×1818100² = 6610975220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818107) 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, 8991 + ... + 9190.

2^1818100 is an apocalyptic number.

1818100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818100 is an abundant number, since it is smaller than the sum of its proper divisors (2127394).

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

1818100 is a wasteful number, since it uses less digits than its factorization.

1818100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18195 (or 18188 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1818100 is about 1348.3693855914. The cubic root of 1818100 is about 122.0504136359.

Multiplying 1818100 by its reverse (18181), we get a square (33054876100 = 181810²).

1818100 divided by its reverse (18181) gives a square (100 = 10²).

It can be divided in two parts, 181 and 8100, that added together give a square (8281 = 91²).

The spelling of 1818100 in words is "one million, eight hundred eighteen thousand, one hundred".