1111820 has 24 divisors (see below), whose sum is σ = 2437344. Its totient is φ = 425216.

The previous prime is 1111801. The next prime is 1111841. The reversal of 1111820 is 281111.

It is a super-2 number, since 2×1111820² = 2472287424800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111795 and 1111804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (101556).

2^1111820 is an apocalyptic number.

1111820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111820 is an abundant number, since it is smaller than the sum of its proper divisors (1325524).

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

1111820 is a wasteful number, since it uses less digits than its factorization.

1111820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449 (or 2447 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1111820 is about 1054.4287552983. The cubic root of 1111820 is about 103.5964390084.

Adding to 1111820 its reverse (281111), we get a palindrome (1392931).

The spelling of 1111820 in words is "one million, one hundred eleven thousand, eight hundred twenty".