1866886920 has 128 divisors (see below), whose sum is σ = 6302016000. Its totient is φ = 491512320.

The previous prime is 1866886891. The next prime is 1866886921. The reversal of 1866886920 is 296886681.

It is a happy number.

1866886920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1866886921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74380 + ... + 96260.

It is an arithmetic number, because the mean of its divisors is an integer number (49234500).

Almost surely, 2^1866886920 is an apocalyptic number.

1866886920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866886920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3151008000).

1866886920 is an abundant number, since it is smaller than the sum of its proper divisors (4435129080).

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

1866886920 is a wasteful number, since it uses less digits than its factorization.

1866886920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21980 (or 21970 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 1866886920 is about 43207.4868512391. The cubic root of 1866886920 is about 1231.3249256714.

The spelling of 1866886920 in words is "one billion, eight hundred sixty-six million, eight hundred eighty-six thousand, nine hundred twenty".