1117820 has 24 divisors (see below), whose sum is σ = 2561328. Its totient is φ = 406400.

The previous prime is 1117819. The next prime is 1117861. The reversal of 1117820 is 287111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1117792 and 1117801.

It is a congruent number.

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, 2321 + ... + 2760.

It is an arithmetic number, because the mean of its divisors is an integer number (106722).

2^1117820 is an apocalyptic number.

1117820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1117820 is an abundant number, since it is smaller than the sum of its proper divisors (1443508).

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

1117820 is a wasteful number, since it uses less digits than its factorization.

1117820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1117820 is about 1057.2700695660. The cubic root of 1117820 is about 103.7824594812.

The spelling of 1117820 in words is "one million, one hundred seventeen thousand, eight hundred twenty".