1200820 has 12 divisors (see below), whose sum is σ = 2521764. Its totient is φ = 480320.

The previous prime is 1200811. The next prime is 1200833. The reversal of 1200820 is 280021.

It can be written as a sum of positive squares in 2 ways, for example, as 944784 + 256036 = 972^2 + 506^2 .

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1200820.

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, 30001 + ... + 30040.

It is an arithmetic number, because the mean of its divisors is an integer number (210147).

2^1200820 is an apocalyptic number.

1200820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200820 is an abundant number, since it is smaller than the sum of its proper divisors (1320944).

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

1200820 is a wasteful number, since it uses less digits than its factorization.

1200820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60050 (or 60048 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1200820 is about 1095.8193281741. The cubic root of 1200820 is about 106.2900564077.

Adding to 1200820 its reverse (280021), we get a palindrome (1480841).

The spelling of 1200820 in words is "one million, two hundred thousand, eight hundred twenty".