1101820 has 24 divisors (see below), whose sum is σ = 2343600. Its totient is φ = 435072.

The previous prime is 1101811. The next prime is 1101839. The reversal of 1101820 is 281011.

It is a self number, because there is not a number n which added to its sum of digits gives 1101820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471 + ... + 2089.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2^1101820 is an apocalyptic number.

1101820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101820 is an abundant number, since it is smaller than the sum of its proper divisors (1241780).

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

1101820 is a wasteful number, since it uses less digits than its factorization.

1101820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 715 counting only the distinct ones).

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

The square root of 1101820 is about 1049.6761405310. The cubic root of 1101820 is about 103.2849119881.

Adding to 1101820 its reverse (281011), we get a palindrome (1382831).

The spelling of 1101820 in words is "one million, one hundred one thousand, eight hundred twenty".