1186820 has 12 divisors (see below), whose sum is σ = 2492364. Its totient is φ = 474720.

The previous prime is 1186813. The next prime is 1186837. The reversal of 1186820 is 286811.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 948676 = 488^2 + 974^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1186820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29651 + ... + 29690.

It is an arithmetic number, because the mean of its divisors is an integer number (207697).

2^1186820 is an apocalyptic number.

1186820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1186820 is an abundant number, since it is smaller than the sum of its proper divisors (1305544).

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

1186820 is a wasteful number, since it uses less digits than its factorization.

1186820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59350 (or 59348 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 1186820 is about 1089.4126858083. The cubic root of 1186820 is about 105.8753726940.

Subtracting from 1186820 its reverse (286811), we obtain a palindrome (900009).

The spelling of 1186820 in words is "one million, one hundred eighty-six thousand, eight hundred twenty".