1866812128 has 48 divisors (see below), whose sum is σ = 3814760880. Its totient is φ = 898200576.

The previous prime is 1866812119. The next prime is 1866812173. The reversal of 1866812128 is 8212186681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287251 + ... + 293677.

It is an arithmetic number, because the mean of its divisors is an integer number (79474185).

Almost surely, 2^1866812128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866812128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907380440).

1866812128 is an abundant number, since it is smaller than the sum of its proper divisors (1947948752).

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

1866812128 is a wasteful number, since it uses less digits than its factorization.

1866812128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779 (or 6771 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 1866812128 is about 43206.6213444190. The cubic root of 1866812128 is about 1231.3084821681.

The spelling of 1866812128 in words is "one billion, eight hundred sixty-six million, eight hundred twelve thousand, one hundred twenty-eight".