1123820 has 24 divisors (see below), whose sum is σ = 2391984. Its totient is φ = 443456.

The previous prime is 1123807. The next prime is 1123841. The reversal of 1123820 is 283211.

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, 1322 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (99666).

2^1123820 is an apocalyptic number.

1123820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123820 is an abundant number, since it is smaller than the sum of its proper divisors (1268164).

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

1123820 is a wasteful number, since it uses less digits than its factorization.

1123820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1123820 is about 1060.1037685057. The cubic root of 1123820 is about 103.9678154848.

The spelling of 1123820 in words is "one million, one hundred twenty-three thousand, eight hundred twenty".