1866844686 has 16 divisors (see below), whose sum is σ = 4267073664. Its totient is φ = 533384184.

The previous prime is 1866844663. The next prime is 1866844717. The reversal of 1866844686 is 6864486681.

1866844686 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 22224300 + ... + 22224383.

It is an arithmetic number, because the mean of its divisors is an integer number (266692104).

Almost surely, 2^1866844686 is an apocalyptic number.

1866844686 is an abundant number, since it is smaller than the sum of its proper divisors (2400228978).

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

1866844686 is a wasteful number, since it uses less digits than its factorization.

1866844686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44448695.

The product of its digits is 10616832, while the sum is 57.

The square root of 1866844686 is about 43206.9981137315. The cubic root of 1866844686 is about 1231.3156403082.

The spelling of 1866844686 in words is "one billion, eight hundred sixty-six million, eight hundred forty-four thousand, six hundred eighty-six".