18940227747840 has 1824 divisors, whose sum is σ = 79564117401600. Its totient is φ = 4161798144000.

The previous prime is 18940227747797. The next prime is 18940227747907. The reversal of 18940227747840 is 4874772204981.

18940227747840 is a `hidden beast` number, since 1 + 8 + 94 + 0 + 2 + 2 + 77 + 478 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 125431971765 + ... + 125431971915.

It is an arithmetic number, because the mean of its divisors is an integer number (43620678400).

Almost surely, 2^{18940227747840} is an apocalyptic number.

18940227747840 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 18940227747840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39782058700800).

18940227747840 is an abundant number, since it is smaller than the sum of its proper divisors (60623889653760).

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

18940227747840 is an frugal number, since it uses more digits than its factorization.

18940227747840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 50577408, while the sum is 63.

The spelling of 18940227747840 in words is "eighteen trillion, nine hundred forty billion, two hundred twenty-seven million, seven hundred forty-seven thousand, eight hundred forty".