1183820 has 24 divisors (see below), whose sum is σ = 2712528. Its totient is φ = 430400.

The previous prime is 1183813. The next prime is 1183837. The reversal of 1183820 is 283811.

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, 2471 + ... + 2910.

It is an arithmetic number, because the mean of its divisors is an integer number (113022).

2^1183820 is an apocalyptic number.

1183820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1183820 is an abundant number, since it is smaller than the sum of its proper divisors (1528708).

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

1183820 is a wasteful number, since it uses less digits than its factorization.

1183820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401 (or 5399 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1183820 is about 1088.0349259100. The cubic root of 1183820 is about 105.7860881290.

Subtracting from 1183820 its reverse (283811), we obtain a palindrome (900009).

The spelling of 1183820 in words is "one million, one hundred eighty-three thousand, eight hundred twenty".