1928381818212 has 72 divisors (see below), whose sum is σ = 4955367336192. Its totient is φ = 632136830400.

The previous prime is 1928381818201. The next prime is 1928381818267. The reversal of 1928381818212 is 2128181838291.

It is a happy number.

1928381818212 is a `hidden beast` number, since 19 + 28 + 381 + 8 + 18 + 212 = 666.

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 23 ways as a sum of consecutive naturals, for example, 11934063 + ... + 12094569.

It is an arithmetic number, because the mean of its divisors is an integer number (68824546336).

Almost surely, 2^{1928381818212} is an apocalyptic number.

1928381818212 is a gapful number since it is divisible by the number (12) 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 1928381818212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2477683668096).

1928381818212 is an abundant number, since it is smaller than the sum of its proper divisors (3026985517980).

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

1928381818212 is a wasteful number, since it uses less digits than its factorization.

1928381818212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166049 (or 166044 counting only the distinct ones).

The product of its digits is 884736, while the sum is 54.

The spelling of 1928381818212 in words is "one trillion, nine hundred twenty-eight billion, three hundred eighty-one million, eight hundred eighteen thousand, two hundred twelve".