1866941680 has 20 divisors (see below), whose sum is σ = 4340639592. Its totient is φ = 746776640.

The previous prime is 1866941669. The next prime is 1866941693. The reversal of 1866941680 is 861496681.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11668306 + ... + 11668465.

Almost surely, 2^1866941680 is an apocalyptic number.

1866941680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866941680 is an abundant number, since it is smaller than the sum of its proper divisors (2473697912).

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

1866941680 is a wasteful number, since it uses less digits than its factorization.

1866941680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23336784 (or 23336778 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 1866941680 is about 43208.1205330665. The cubic root of 1866941680 is about 1231.3369647319.

The spelling of 1866941680 in words is "one billion, eight hundred sixty-six million, nine hundred forty-one thousand, six hundred eighty".