1113820 has 12 divisors (see below), whose sum is σ = 2339064. Its totient is φ = 445520.

The previous prime is 1113809. The next prime is 1113859. The reversal of 1113820 is 283111.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1113794 and 1113803.

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 3 ways as a sum of consecutive naturals, for example, 27826 + ... + 27865.

It is an arithmetic number, because the mean of its divisors is an integer number (194922).

2^1113820 is an apocalyptic number.

1113820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1113820 is an abundant number, since it is smaller than the sum of its proper divisors (1225244).

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

1113820 is a wasteful number, since it uses less digits than its factorization.

1113820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55700 (or 55698 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1113820 is about 1055.3767099951. The cubic root of 1113820 is about 103.6585200304.

Adding to 1113820 its reverse (283111), we get a palindrome (1396931).

It can be divided in two parts, 11 and 13820, that added together give a palindrome (13831).

The spelling of 1113820 in words is "one million, one hundred thirteen thousand, eight hundred twenty".