1866798906 has 64 divisors (see below), whose sum is σ = 4505088000. Its totient is φ = 503775936.

The previous prime is 1866798893. The next prime is 1866798911. The reversal of 1866798906 is 6098976681.

It is a self number, because there is not a number n which added to its sum of digits gives 1866798906.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 275151 + ... + 281853.

It is an arithmetic number, because the mean of its divisors is an integer number (70392000).

Almost surely, 2^1866798906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866798906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2252544000).

1866798906 is an abundant number, since it is smaller than the sum of its proper divisors (2638289094).

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

1866798906 is a wasteful number, since it uses less digits than its factorization.

1866798906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 1866798906 is about 43206.4683351926. The cubic root of 1866798906 is about 1231.3055751805.

The spelling of 1866798906 in words is "one billion, eight hundred sixty-six million, seven hundred ninety-eight thousand, nine hundred six".