1889821816 has 8 divisors (see below), whose sum is σ = 3543415920. Its totient is φ = 944910904.

The previous prime is 1889821781. The next prime is 1889821819. The reversal of 1889821816 is 6181289881.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889821819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118113856 + ... + 118113871.

It is an arithmetic number, because the mean of its divisors is an integer number (442926990).

Almost surely, 2^1889821816 is an apocalyptic number.

It is an amenable number.

1889821816 is a deficient number, since it is larger than the sum of its proper divisors (1653594104).

1889821816 is a wasteful number, since it uses less digits than its factorization.

1889821816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236227733 (or 236227729 counting only the distinct ones).

The product of its digits is 442368, while the sum is 52.

The square root of 1889821816 is about 43472.0808795714. The cubic root of 1889821816 is about 1236.3467343776.

The spelling of 1889821816 in words is "one billion, eight hundred eighty-nine million, eight hundred twenty-one thousand, eight hundred sixteen".