1820684212 has 12 divisors (see below), whose sum is σ = 3263909796. Its totient is φ = 888138560.

The previous prime is 1820684189. The next prime is 1820684213. The reversal of 1820684212 is 2124860281.

It can be written as a sum of positive squares in 2 ways, for example, as 971194896 + 849489316 = 31164^2 + 29146^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820684213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550703 + ... + 5551030.

It is an arithmetic number, because the mean of its divisors is an integer number (271992483).

Almost surely, 2^1820684212 is an apocalyptic number.

It is an amenable number.

1820684212 is a deficient number, since it is larger than the sum of its proper divisors (1443225584).

1820684212 is a wasteful number, since it uses less digits than its factorization.

1820684212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101778 (or 11101776 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1820684212 is about 42669.4763501968. The cubic root of 1820684212 is about 1221.0821295478.

The spelling of 1820684212 in words is "one billion, eight hundred twenty million, six hundred eighty-four thousand, two hundred twelve".