1200002820 has 24 divisors (see below), whose sum is σ = 3360008064. Its totient is φ = 320000736.

The previous prime is 1200002819. The next prime is 1200002827. The reversal of 1200002820 is 282000021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1200002820.

It is not an unprimeable number, because it can be changed into a prime (1200002827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9999964 + ... + 10000083.

It is an arithmetic number, because the mean of its divisors is an integer number (140000336).

Almost surely, 2^1200002820 is an apocalyptic number.

1200002820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200002820 is an abundant number, since it is smaller than the sum of its proper divisors (2160005244).

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

1200002820 is a wasteful number, since it uses less digits than its factorization.

1200002820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20000059 (or 20000057 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1200002820 is about 34641.0568545476. The cubic root of 1200002820 is about 1062.6594015978.

Adding to 1200002820 its reverse (282000021), we get a palindrome (1482002841).

The spelling of 1200002820 in words is "one billion, two hundred million, two thousand, eight hundred twenty".