1143820 has 12 divisors (see below), whose sum is σ = 2402064. Its totient is φ = 457520.

The previous prime is 1143817. The next prime is 1143829. The reversal of 1143820 is 283411.

It is not an unprimeable number, because it can be changed into a prime (1143829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28576 + ... + 28615.

It is an arithmetic number, because the mean of its divisors is an integer number (200172).

2^1143820 is an apocalyptic number.

1143820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1143820 is an abundant number, since it is smaller than the sum of its proper divisors (1258244).

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

1143820 is a wasteful number, since it uses less digits than its factorization.

1143820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57200 (or 57198 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1143820 is about 1069.4952080304. The cubic root of 1143820 is about 104.5809450451.

The spelling of 1143820 in words is "one million, one hundred forty-three thousand, eight hundred twenty".