1860221859840 has 384 divisors, whose sum is σ = 6622861190400. Its totient is φ = 495282585600.

The previous prime is 1860221859827. The next prime is 1860221859869. The reversal of 1860221859840 is 489581220681.

1860221859840 is a `hidden beast` number, since 1 + 8 + 6 + 0 + 2 + 2 + 1 + 8 + 598 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188830915 + ... + 188840765.

It is an arithmetic number, because the mean of its divisors is an integer number (17247034350).

Almost surely, 2^{1860221859840} is an apocalyptic number.

1860221859840 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 1860221859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3311430595200).

1860221859840 is an abundant number, since it is smaller than the sum of its proper divisors (4762639330560).

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

1860221859840 is an equidigital number, since it uses as much as digits as its factorization.

1860221859840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570 (or 10544 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 1860221859840 in words is "one trillion, eight hundred sixty billion, two hundred twenty-one million, eight hundred fifty-nine thousand, eight hundred forty".