1820228866 has 16 divisors (see below), whose sum is σ = 2835260568. Its totient is φ = 875750400.

The previous prime is 1820228843. The next prime is 1820228869. The reversal of 1820228866 is 6688220281.

It can be written as a sum of positive squares in 4 ways, for example, as 1542839841 + 277389025 = 39279^2 + 16655^2 .

It is not an unprimeable number, because it can be changed into a prime (1820228869) 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 7 ways as a sum of consecutive naturals, for example, 146055 + ... + 158026.

Almost surely, 2^1820228866 is an apocalyptic number.

1820228866 is a deficient number, since it is larger than the sum of its proper divisors (1015031702).

1820228866 is a wasteful number, since it uses less digits than its factorization.

1820228866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304197.

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 1820228866 is about 42664.1402819745. The cubic root of 1820228866 is about 1220.9803251056.

The spelling of 1820228866 in words is "one billion, eight hundred twenty million, two hundred twenty-eight thousand, eight hundred sixty-six".