1188820 has 12 divisors (see below), whose sum is σ = 2496564. Its totient is φ = 475520.

The previous prime is 1188787. The next prime is 1188839. The reversal of 1188820 is 288811.

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 944784 = 494^2 + 972^2 .

It is a congruent number.

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, 29701 + ... + 29740.

It is an arithmetic number, because the mean of its divisors is an integer number (208047).

2^1188820 is an apocalyptic number.

1188820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1188820 is an abundant number, since it is smaller than the sum of its proper divisors (1307744).

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

1188820 is a wasteful number, since it uses less digits than its factorization.

1188820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59450 (or 59448 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1188820 is about 1090.3302252070. The cubic root of 1188820 is about 105.9348121796.

Subtracting from 1188820 its reverse (288811), we obtain a palindrome (900009).

It can be divided in two parts, 11 and 88820, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 1188820 in words is "one million, one hundred eighty-eight thousand, eight hundred twenty".