1100001820 has 12 divisors (see below), whose sum is σ = 2310003864. Its totient is φ = 440000720.

The previous prime is 1100001811. The next prime is 1100001863. The reversal of 1100001820 is 281000011.

1100001820 is a modest number, since divided by 1820 gives 1100 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1100001820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27500026 + ... + 27500065.

It is an arithmetic number, because the mean of its divisors is an integer number (192500322).

Almost surely, 2^1100001820 is an apocalyptic number.

1100001820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100001820 is an abundant number, since it is smaller than the sum of its proper divisors (1210002044).

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

1100001820 is a wasteful number, since it uses less digits than its factorization.

1100001820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55000100 (or 55000098 counting only the distinct ones).

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

The square root of 1100001820 is about 33166.2753410750. The cubic root of 1100001820 is about 1032.2806847742.

Adding to 1100001820 its reverse (281000011), we get a palindrome (1381001831).

The spelling of 1100001820 in words is "one billion, one hundred million, one thousand, eight hundred twenty".