1889444443820 has 24 divisors (see below), whose sum is σ = 3968958468384. Its totient is φ = 755563465856.

The previous prime is 1889444443769. The next prime is 1889444443879. The reversal of 1889444443820 is 283444449881.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1889444443820.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13322177 + ... + 13463256.

It is an arithmetic number, because the mean of its divisors is an integer number (165373269516).

Almost surely, 2^{1889444443820} is an apocalyptic number.

1889444443820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1889444443820 is an abundant number, since it is smaller than the sum of its proper divisors (2079514024564).

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

1889444443820 is a wasteful number, since it uses less digits than its factorization.

1889444443820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26788969 (or 26788967 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 59.

The spelling of 1889444443820 in words is "one trillion, eight hundred eighty-nine billion, four hundred forty-four million, four hundred forty-three thousand, eight hundred twenty".